Typically metal studs are hollow, so you won't be getting the thread bite(surface area) as you would with wood studs, as the part that's inside the stud will only bit on a thin piece of metal. You could try it without doing too much damage(as if it didn't work and you had to patch up the small holes in the wall). I would try to mount something with the same+15% weight as the tv before I actually hung the tv itself on it. Cinder blocks or something, maybe even cantilever it so that it puts even more of a strain on the mounting system to see if it holds. You don't want your tv falling off the wall.
-Alan
-Alan
