I didn't even know I wanted this but when I saw the price I couldn't say no! I easily mounted it to my desk and attached my Dell U2717D without any issues. The included hardware worked perfect for assembly and would 100% recommend this mount arm if you're looking to clean up your desk.

Easy installation, simple design, each link is adjustable for tension, great price. Love it.

I haven't used it , yet, although the stand was beautifully packaged with the impressive accessories.

Super solid construction, those black parts might look plastic but they're TOUGH steel or aluminum. My desk is a little weird so setup was different but now I have a monitor mounted above my iMac and it works fantasticly.

I used this mount to install a TV in a travel trailer. The space for it was limited, and I wound up having to reduce the length of the vertical bar so that the mount would fit the space between a shelf and the ceiling of the trailer. I succeeded in trimming it. However, because of the way the mount is made, the TV points slightly upwards.

Some missing measurements:
Mounts to tables up to 4cm thick and the clamp part is 7cm long by 6.6cm wide , which means it won't work on desks like IKEA MELLTORP or TÄRENDÖ. For thick tables probably look for 5402 (no portrait position I think) or 7562 (more expensive and assembly required).
Weight: 2050g + 200g for the mounting plate

I can't comment on whether the monitor will sag since I support it with an empty bottle. For $25 there isn't really much to complain. "3-way adjustable" gives good flexibility, I pull it out to use and stow it back when I'm done.

PROS: Comes fully assembled

CONS: Allen key required to make adjustment (so don't lose them)
Doesn't mount to thicker tables

I purchased this unit expressly to use at home in my recording studio for voice-over. It took about fifteen minutes to set up. The unit was stiff and made me a little anxious about adjustments initially. Once I'd broken it in a bit, however, it was easy enough to adjust.

I was impressed enough with the stand, that I purchased another unit for my desk at work. It was quickly noticed by my co-workers, and has subsequently become the standard for our developers to use when coding, because it allows the screen to easily rotate 90 degrees to present the code in portrait view.

I rated this as 4 stars due to some areas where it could improve: greater ease in adjusting the height and greater firmness in the tilt. I think 4.5 stars is more accurate, but it wasn't an option. Regardless, it's a safe purchase, and Monoprice's support of their products is second to none.

PROS: Sturdy.
Easy to set up.
Flexible in terms of placement and most adjustments.

CONS: A little stiff initially.
Making adjustments to the vertical placement requires using the Allen wrench.
The tilt component is not as firm as I would like it to be.

Stand had a design flaw. There are 4 tiny screws which attach the black base to the chrome post (it is not welded). The threads are very small. The screws pull out of the post and the stand and your monitor come crashing to the ground. I have submitted a support ticket, don't know what Monoprice will do, but I would stay away from this. The monitor I was supporting only weighed 6 lbs, so it was not overweight.

Works well and is sturdy.

PROS: Sturdy

CONS: VESA screws provided are slightly to long for for Monoprice 28" monitor (product number 13809).

Great mount, and surprisingly well built given the cost. It was missing one allen key, and the duty really did sour the buy, but, after it's up and mounted with the monitor, it looks and functions great.

PROS: * Mount is great quality

* Good support

* Works for 27' monitor

* No issues with mounting or movement

CONS: * Duty surprise ended up essentially doubling the cost of this mount. If in Canada, look at other sellers that sell from Canada

* Was missing an Allen key to mount. Not an issue as I have some, but was expecting as it came with one

* The monitor turns from 180 to 90 wayyy to easily. It's been tightened and everything that can be done to fix this has been tried, but still no luck