This wall mount is pretty amazing. I'll go over the only downfall first. The bolts that come with the mount seem small. And I tightened one (because I freak out when I'm putting a 2k$ TV on a wall) way too tight where the head of the bolt popped off. I had extra bolts at the house and used those. So it's not really a downfall, just be weary of tightening them too much.
So the mount itself is really impressive. I mounted a 50" TV to it with little issues. It is extremely sturdy and it's great that it can come off the wall as much as it can. I thought it might have issues once it was fully extended, and granted it does angle down just slightly as the TV is fully extended, but not enough to notice. Even if it bothers you, you can angle up the TV so that it is perfectly even. Overall I think this mount was an amazing purchase and what more could you as for at the price it's going for?
The only other thing I could tell you, is that it doesn't go completely against the wall, it probably will always be 2-3" or so from the wall (if that much). But you get this mount so you can see it from the kitchen at an angle, or from the other side of the room. You get this mount for the different angles it makes available, not to make it flush with the wall. And that much from the wall isn't even noticeable. Great thing about it being able to pull out, is that when you need to add cables to the tv, you don't have to go through some cumbersome process, you just pull the TV out and plug in.