Ergotech Heavy Duty 2 x 2 Quad Desk Stand with 28-Inch Pole - Black (100-D28-B22-HD)

The heavy base on this unit provides good stability, and the adjustability of the arms and mounts allows for a nice complex curve for the monitors. Take a bit of time to perform the adjustments, and it will look great! I have 4 Dell 22" monitors mounted with no issues. The mounting knuckles have a bit of lash, but are easily positioned (you have to lift them further than you think is required to get to a point the adjustment takes place, and when they fall back into position, the new adjustment is apparent). The way the mounts hang on the arms makes it really quick and easy to remove them, with just a thumb latch, no tools. This makes the whole installation easy to move from office to office. Takes a bit of muscle to tighten the mounts, but not excessive. We have more than a dozen of these around our complex.

Got the one for 6 monitors and it had the some adjustable brackets, this one didn't have any but still a great stand. I would buy it again.

works as intended, however, adjustments are finicky and limited. One bolt does not tighten very well, so the monitor angles down towards the desk.