I used the mount with a 19 inch monitor, so I can't say anything about it's quoted max capacity. I will say that I had to use a different monitor than the one I intended to use because the original had a bump on the back for the stand, which this mount couldn't accommodate (1. multiple extra monitors at work, so not a major issue for me; 2. this is designed with much larger screens in mind). I like the cable channel in the arm, and really appreciate the easy to put on/remove bracket for the VESA plate; it made getting the monitor up much, much easier than a normal VESA mount.
Was looking at more expensive mounts but settled on this one because, the way I see it, simple is best. And I'm glad I did. Two wall anchors, not four. Tilt and swivel, check. Cable wire-way, perfect. Inexpensive, winner! Well-built, easy to install and operates easily. Great product.