The seller you list in your OP, I have bought cables from them before. Always superior quality.
When wall mounting our TV we got a cheap one from Visions.
This one- I think. The problem was the amount of metal it ends up biting with is about a millimetre. So all it would take is a little bump from below to come crashing down. Returned it and got another. The one we had originally my son and I fought with getting it hung for almost an hour. The replacement took us about a minute. (Hanging the TV, not attaching the wall plate part.) My wife was shocked that it was that much easier.
So there is something to be said for being able to view the mount before buying it.