I thought I'd save a little money by putting this cassette and corresponding chain on my otherwise-Force build. The parts are still new (300ish miles), but I'm a little disconcerted that I can make the chain slip on the cassette if I really try. I know what some of you are probably thinking; the chain, chainrings, cassette were all replaced at the same time, and the chain is the proper length.
I should also note than I'm currently about 200 lbs and have decently strong legs, although I do not know how much power I put out (yet).
If any of this has you concerned, go with PG-1170 or better. and you'll be fine.