Amazon's deliver of these units was amazingly fast. I ordered them and had it the very next day.
I amusing these to wall mount my 2 flat panel monitors, for my computer. One is 27" and the other 28". I was concerned that it would not work, as the 28" is an older model, and quite heavy. Fortunately, the mounts' have worked perfectly. For such a large and heavy monitor, I did have to tighten the pivot with a wrench (not enough to break it, but much tighter than just your finger tightening).
Were I to purchase mounts again, I would definitely want a third arm - to provide even more flexibility. Also, it would be HUGELY useful to have the ability to have some up-down adjustment capability.
However, for JUST $20 each - these mount brackets/arms are fantastic. They are very sturdy. I have complete confidence in the, and have not given it a second thought since mounting them.
Great mounts. Great quality. Great Price. Great Buy!