If I need to order another, this will be the one.  I used this to mount a TV to the wall in my basement and it allows me to pull the tv out from the wall and turn it towards my desk so I can watch TV while working on the PC, nearly a 90 degree angle.  My TV is only a 32" and I could see that this would work up to a 40" or so, but if you don't need to turn the TV 90 degrees, you could get by with a larger TV.