The tv bracket is great - it does exactly what it says on the tin.
I did not fit the fold out extension arm as i decided that the leverage the weight of the tv would create would be to much- nothing to do with the bracket- the internal walls of the house are dry lined ie. 12mm plaster board on thin metal framed studwork absolute rubbish. Anything that requires substantial fixings ie wall hung vanity units/TV brackets etc - the plaster board needs taking off and patrisses (sections of timber/ply) fitted and plaster board replacing . This was to much disruption so just used the fixed part of the wall bracket which is great.
When the missus calms down after all the disruption of moving house i may suggest doing the work to enable the fitting of the arm as having fitted a few of these for clients, it makes the TV appear to float in mid air when viewed straight on.