I do not know the cheaper models and want to say anything about their features and quality, but they do seem to be very good also.
The scope of supply: A not very light package that besides the holder contains everything you need (screws and plugs for wall, which leave no doubt that the thing holding Allen wrench to adjust the strength of the adjustment Miscellaneous Screws for mounting the rails.. on TV). Only no drifter was there, I had to borrow. That the holder makes an extreme robust impression has already been mentioned here.
Attachment: I was afraid that because two people have to juggle with the television while a fixed screwed, but that's not the case. Only the holder of the TV mount (comes loose alone), then the bracket to the wall Screw (a helping, even delicate hand, is sufficient, but it also manages alone) and finally mount the TV (I could have done alone, second course easier, should the TV alone can not lift). After that I then unscrewed the foot, which was still there.
Adjustment: Here you can really adjust everything, clear the rotation, then the slope in front back, you can tilt the television (for the spirit level) and slide quite a bit right left. Sure, for the holes you take a proper water balance at hand, but in the end could be times kloppen the thing also Pi thumb against the wall and turn everything afterwards properly. The height can be easily adjusted, of course, by the television you lose weight again and the rails slightly offset (which of course is not a feature of the bracket).
As for the inclination, it is 20 ° and not 2x 20 °, it is believed by some as here. 15 ° downwards, 5 ° upwards, which is perfectly adequate. The slope down one need at a very high attachment that one tends upwards rather rare (unless you look in between standing or sitting as I sometimes on the exercise bike, but it is sufficient, although the TV quite deep is attached).
Conclusion: 5 stars with asterisks. Here I have nothing to complain pure. Quality, features, fixing material and above all the easy have fully convinced me.