Excellent monitor arm. I use it with a 27" Acer monitor (right on the upper edge of the acceptable specs for the monitor arm) and it works well. You just have to tighten the tension bolt several turns for it to be able to hold the weight.

The mounting parts go together nicely and it's nice to have the option to either clamp it to the edge of a desk or bolt it to the desk via a through-hole.Unfortunately, I can't give very high marks to this product, as the gas spring itself is of poor quality. The mechanism can only reliably hold my monitor (9.5 lbs, well within the limitations of the mount) off the desk at 6 inches from the desk surface to the bottom of the monitor, roughly 10 inches from the surface of the desk to the VESA mount. Anything lower than that and the spring refuses to hold, allowing my monitor to drop all the way down to the desk surface. The instruction manual says to tighten the tension nut with an Allen wrench (included), but after having tightened it to the absolute maximum degree physically possible, it still fails to hold the monitor up properly.I'm quite disappointed in this product.

I like the price, but I had to _really_ tighten it down in order to use it with a 27?ǥ monitor?not a huge deal, but a little weird. The part that really bothers me is that the hinge that holds the monitor perpendicular to the desk (i.e. keeps the monitor straight up and down) is really bad. I had to torque on it pretty hard to get it tight enough to hold the monitor without the monitor falling forward. But if I touch the monitor to adjust it, it still tends to slip a bit in that hinge. Which means every time I touch the monitor to adjust it, I end up fighting with that hinge and fighting to get the monitor vertical again. It?s a pain and totally defeats the purpose of having a nice gas spring that?s intended to allow you to easily adjust the monitor. I would not recommend this mount.

I purchased two of these mounts for two different monitors. One mount worked perfectly and the other mount would not hold a 12lb monitor up, regardless of how much tightening or adjustment was made. I'm not sure if the mount was defective or the specs were not accurate, either way I returned it and ordered the next larger mount to cover my needs.

Just installed. Can't hold the monitor up. Monitor weighs 9.83 lb (4.46 kg). Tension adjustment does nothing.