This is exactly what I needed.  It was easy to mount and supports my 40 inch TV (26 lbs) without any issue.  I haven't tested the extension brackets, but the rest of the device is very solid.  I will say that the hinges can be a bit tight, and it's not designed to be easily adjustable on the fly (you'll need a few tools).  If you plan on swinging your TV around a lot, this might not be the best choice, but it works perfectly fine if you only need to adjust it every now and then.  My favorite part is the small base.  I didn't have a lot of wall space to mount a TV, and this met my needs without eating all my money.  Keep in mind that you'll want at least two people to mount the TV on this device.  I attached my TV alone by precariously balancing it on a stack of boxes while I inserted the screws.  Speaking of which, I've mounted two TVs on this, and the box included screws which fit both (in addition to many more).  However, you may need a few more washers.