I was in a mechanized infantry unit in the mid 70s (retired from the Army in 1992). Somebody had a leatherman and tried to use it on a bolt in the engine compartment. The bolt won and the leatherman broke off. Since then I've never bought nor used one. I don't trust them. They aren't "G.I. Proof" and are, thus, useless in the field. I needed tools 100% working 100% of the time.
The Leatherman Super Tool is a whole lot heavier than an original Leatherman -- hold them side by side and there's really no comparison. My Super Tool has always stood up to the abuse from this GI so far.