I've had a leatherman supertool for 12 years, and it's been flawless, although I haven't used it in "hard use" scenarios. I do carry it whenever hiking, backpacking, etc. I tend to use my regular tools instead when I need pliers, a file, a punch, etc.
I do have the sense that IF I used too much force, like trying to use the thing as a pry bar, that the blades or the bolt (if that's the word) might break. It works fine as a quick-fix screwdriver and knife.
So, I can't say anything bad about the Leatherman.