I have three of those for my guitars (strat, jazzmaster, Les Paul). They seem sturdy enough, have been using them for a few months now with no issues. I like that the holding part rotates to accomodate non-symmetric guitar headstocks.
For reference, there is 8.5cm clearance between the back of the strat and the wall.
Not all of them were well painted, some had dings/scratches/unpainted spots, but nothing crazy. Not noticeable when they hang up on the wall.