I bought an Ergotron lx arm 45-241-026 for my wacom cintiq 12 wx. It's really fantastic!
I made a video to show how i set up it on my desk. If You want you can find it at this address:
It works well because my tablet is not very heavy but I wonder if it's reliable with heavier tablets (cintiq 22HD, 24HH or 27QHD) .
Does anyone else use it and could tell me if it's works?