LogitechM575 Ergonomic Wireless Trackball USB Mouse, Black (910-005869)Carbon Neutral Certified by SCS Global Services

I owned the previous model of this wireless trackball mouse and have owned 3 Logitech mice so far, so I decided to upgrade to the latest version—and Logitech has done it again with another fantastic product! The improvements are noticeable, from the refined design to the seamless wireless connectivity and lack of any latency issue's. It offers incredible value for the price, combining top-notch quality with flawless performance.The precision and smooth tracking make it perfect for both work and everyday use, and the ergonomic design ensures hours of comfort. Setup was quick and effortless, and the battery life is as reliable as ever. If you’re looking for a quality trackball mouse, I can’t recommend this one enough!

So I've been using Logitech thumb-based trackballs since they were rectangular and connected with a DE-9 serial connection. I swear by them and have converted many others.The advantages are clear: you don't need huge swaths of desk space to move them around, you can remove your thumb from the ball so you don't inadvertently move the cursor when you click, and the interface is extremely intuitive and easy to use. The biggest disadvantage is that they are solely right-handed -- my two lefty kids can't use them. The kids also say they're not great for gaming so that might be a factor; my youngest uses some specialty mouse designed specifically for gaming.As for this particular model, it's not terribly different from the previous M570. Note: in the pictures, the new M575 has the more silver ball; the one with the more blue ball is an M570.The forward/backward buttons (between the left mouse button and the trackball) are less prominent on the newer model and include indentations that appear to be simple circles. I'm guessing that the circles are meant to give your finger a reference point to be able to click without looking but I find them more annoying than useful (they feel like there's a piece of dirt or something stuck to them) and the prominent buttons of the M570 were easier to feel, as well as being less susceptible to accidental clicks.The palmrest part of new M575 as some subtle ribbing, probably meant to keep your hand from slipping from side to side but it's honestly just another annoyance. Not enough to prevent me from using it but given the choice, I would prefer it without.The activity light/battery warning light has moved from just behind the forward/back buttons to the middle behind the main mouse buttons. Not a problem at all, just different. I will note that the light on the M570 can be seen even when your hand is on the trackball whereas this one is covered up by your hand.The trackball itself is fine; I think I like the old blue color better but there doesn't seem to be any other difference.The bottom of the trackball is not functionally different from the old version and it's good to see that the slot is still there in the battery compartment to hold the receiver. The power switch is a little smaller and harder to access but still perfectly functional. There is a new button that appears to switch the trackball from using the receiver to using bluetooth -- a handy feature if you want to use it with something like a tablet, I suppose. (I've not tried it via bluetooth.)If you're thinking about upgrading from an older M570, you'll feel right at home, for the most part, but I don't think there's any compelling reason to rush right out and get one. I bought a new one because the scroll wheel on my old one stopped working reliably. Had it not, I'd still be using the M570. (Note: I still use an M570 in my office, as does my wife.)If you're new to this style of trackball, imagine laying your hand on a gently curved rest and moving your thumb around. It's comfortable and less stressful than a traditional mouse and it requires a lot less free desk space. It doesn't need any particular type of surface; I've used it with it on my leg, on the bus seat next to me, and on my bed.It's not the cheapest device in the world but if you're hesitant to spend $50 on a trackball, you're probably not a heavy or serious user. Gamers will probably look elsewhere and possibly even pay more; casual users will be looking for something in the $15-25 range. I'm in front of a computer 8-12 hours per day and I don't mind spending a bit on something to make that experience more efficient and more comfortable. If you want to try a trackball without spending as much, there are some decent knock-offs on Amazon that should be fine. But if you don't mind investing in something like this, it's well worth it.

This is a really perfect mouse for my use. Love having the trackball instead of having to move my mouse. It really works great just even on the arm of a couch, recliner, etc. connects and works flawlessly.

Absolutely love this! Smooth to use. Took a little adjusting from a regular mouse. Love this one as I can maneuver around the screen with ease, faster and smoother. I have only had a couple of weeks currently so can’t speak to the battery use.

My good old 570 tried to drink my coffee yesterday, and had an adverse reaction to it... so after 10+ years using the 570 I finally had to upgrade. The Ergo + and Ergo Advanced are literally bigger, heavier, and generally worse devices to use... so the 575 is really the only real choice at the moment and I really have to wonder why Logitech is thinking. They can't flip the model to make a 575 for lefties, but boy can they make some worse designs for righties!Sarcasm aside; Here are the pluses and minuses for those considering moving from the 'older' thumb-ball mice to the newer ones:The Bad: This is what is important, so I put it first... just know that there are some genuine 'good' points further down!1) The body of the mouse is wider. There is a groove for a pinky rest on the plastic for those with micro-hands that couldn't possibly fit the rest of the mouse's size comfortably instead of just sloping down. For me personally... this is the loss of a star. I use a thumb-ball mouse because my computer setup is at a couch/TV setup, which means that I am constantly holding the mouse at odd angles, and picking it up and putting it down. The widening of the base means that I can't as easily pick up the mouse between my thumb and pinky, and when holding the mouse against the side of my leg I have to put 'downward' pressure on the mouse to keep it in place instead of it naturally resting the weight of the mouse on my pinky finger. This sounds like a ridiculous complaint... but as the primary use case of the device is for weird situations where you aren't at a desk where a standard mouse would frankly be easier to use, this is absolutely a step in the wrong direction. And again, because it is a mouse designed with larger hands in mind, where the pinky rest is doesn't work anyways. Just a weird decision all around. Going even wider with a more pronounced pinky rest would have been a good move, or going slightly smaller would have been better... this just serves nobody. A major fail for a mouse that is designed around 'ergonomics'.2) It is heavier than the old 570. Now for a traditional mouse, this would be a plus in my opinion. I like big heavy tactile traditional mice.... but for a device that is getting picked up, and moved, and held at odd angles... weight is a bad thing. A weighted thumb-ball could be a neat... but an overall heavier device seems like a weird choice for a product designed around ergonomics, and a company as cheap as Logi(tech) who typically wants to use less plastic and parts instead of more.3) Still no left-right side scrolling feature. I would LOVE to have this feature... the newer and fancier models have this feature... but I am not willing to spend $30-50 extra to get this feature along side the added down-sides of the more expensive models. Come on Logi! Give the people what they want already, don't make us pay an extra $30 for a 50 cent feature! Hopefully in another 10 years when I have to replace my mouse again this will be a standard feature.The Meh: Stuff I'm not a fan of, but I'm not convinced it isn't user error, or simple preference1) The mouse movement... just isn't the same. I am having difficulties putting my finger (thumb?) on it, but the motion is... just different. On the 570 there was a kind of extreme use of mouse acceleration, so on a large display, or multiple displays, you would just flick the ball to throw the cursor across the screen, but then when moving it you had finer control over the movements. With the 575, it just isn't as extreme? At the default sensitivity (50%) flicking the ball doesn't quite get the mouse all the way to the opposite corner, but the fine control feels much better and more accurate. But moving the sensitivity up a bit immediately makes the fine control much worse, but I can at least flick the mouse across the display easier. I'm not going to call this a 'negative' exactly... just 'different' from every other thumb-ball mouse they have previously produced. Probably just something to get use to?2) Another thing weirding me out is the texture. My old 570 has a very smooth finish to it... what I can't quite remember is if it was always that way, or it has just worn to become that way over the last 10+ years. Either way, it made it more 'grippy' which was great for my use-case. The 575 has these weird ribs under the palm rest, which is weird but not bad... but the plastic has a sort of satin texture to it which makes it more slippery and difficult to hold. I don't anticipate the texture surviving very long considering how hard I am on my devices, and it will 'wear in' over time... but while I like the feel in hand better, I anticipate that I will drop this far more often than it's older counterpart.The Good: Actually a lot of good! Even if my main complaints about size and weight affect me more.1) There is a 575 and a 575s. The old 570 was always a weird compromise where it had a quiet click, but it was tactile, which was always weird. I got use to it, but I like having the satisfying tactile and auditory 'click' on the 575. The 575s is the 'silent' option for people who don't actively and quickly use their devices and need that feedback to know that they can move on.2) I also like the more muted blue on the mouse ball. The old bright blue was 'iconic' but that didn't mean it looked good. Aesthetically, this is a step up... not that I look at my mouse all that often.3) Better DPI (and polling rate?)! As one of those few weirdos that games with a thumb-ball, I can already tell that this will be a massive step up from the old 570 in terms of responsiveness. While you can't 'throw' the ball as effectively for big-screen desktop use, overall accuracy feels much more responsive and accurate, and I can already tell when trying to grab the edge of a window to resize things I am having a much easier time.4) The mouse sensor behind the ball also looks like a traditional mouse sensor now instead of being something weirdly custom behind a sheet of plastic that would always fall off of the 570 units. This should make things easier to clean, and less likely for gunk and lint to fall though the open space. Overall improvement!5) Full support in Logi Options+. The old 570 would let you pair and do a few things in the Options+ software to make it usable... but had limitations on what it let you assign to buttons. Kind of silly as it was all software, but at least now I have the 'whole box of crayons' to play with for assigning macros and other options to the buttons. I had to use the old software to do anything beyond sensitivity or flipping left-right buttons (truly a silly feature for a right-handed mouse). Will I use it? Probably not as I don't think I have ever used the forward and back buttons on purpose; But it is nice to have full support regardless.