I was a bit dubious about whether or not this thing would actually work - I wanted to mount a 32" TV on it and while it isn't eaxctly heavy, it isn't exactly light, either. But I threw caution to the wind, being the urban rebel that I am, and now I'm glad I did.
If you follow the instructions properly, and make sure you get the bracket fixed to the wall tightly, it's hard to imagine how anything can go wrong - the TV side of it is a breeze.
The only slight problem I found was that it's a bit stiff to start with. But a squirt of WD40 in the joints put that right and now I can push the TV around with one finger AND it stays where I leave it.
This turned out to be a great buy.