I ordered this bad boy and was quite happy, it had a built in spirit level, can't mount that wonky.
Drilled a hole, slapped one of the provided wall plugs in and screwed in one of the bolts to hold the mounting plate against the wall. Tightened it up so I could mark out the other holes and used the built in spirit level to get it nice and straight n level. The plate looked out, so I dug out a spirit level and placed it on, to find it slightly out. I dug out another spirit level and this showed one end of the plate was slightly higher.
At this point, I put trust into my mighty 60cm spirit level, used it for all my kitchen cupboards and all the shelves in my house and they are all as level as a world final snooker table. Wall mount went up, plonked the tv on and all was nice and level.
At this point, I took off the tv and took off the built in spirit level and turned it around and put the little blighter back on. Now the spirit level was saying my wall mount was horizontal. Moral of this rather boring story is don't trust the built in spirit level if you want a tv to look as awesome as mine on the wall.
If you want a low profile wall mount, look else where, but I like the way I can use any old lead with out having to bend it 90 degrees due to the wall being so close.
Took a star off for the dodgy spirit level, I was quite put out by having to go to my shed and root out my spirit levels. I had to battle with cobwebs and risk the nagging from my wife about doing the lawn while I was in there.............