I work in the engine room of boats and need safe, dependable pants.  These are them.  I'm not kind to my work cloths by any means and fully expected them to be ripped by now but thats not the case.  They are holding up just fine.  I would say my only gripe with them (I'm getting very picky here) is that they are heavy.  I have no doubt that it's their weight (thickness of the material) that helps make them good but at the end of the job, they are soaked in sweat and even heavier.
In my perfect world I'd have these pants in a thinner material that's designed for use down here in South Florida's heat.