I just installed the holder on my wall and I see a very large deformation of the substrate due to the weight of my TV.
>>> I have a 60-inch plasma TV that makes a little less than 50 kg and the support is not rigid enough.
The part to fix the TV has an adjustment of the vertical axis: This one was set to maximum upward and tight screws. (In theory you can adjust the angle of your TV up or down)
Once hooked, my Plasma is too heavy and the screen twists the arm bracket to the point where the screen is finally tilted slightly down!
The notice states that though this support is compatible up to 64 "and 60kg but this is not the case: the twisting of the arm is very visible and sheet metal wall bracket is deformed under the effect of the weight of the unit . (the one the TV is hooked and yet is thick)
So we were very afraid it loose and have decided not to use it.
Note that I have not had instruction in French but only in German and that the fixing in the wall did not pose any particular problem.
I would highly recommend this to those who have a large TV as mine although it may give complete satisfaction to much lighter TV owners.