I'm using it at the moment, not great but still usable. Only using it cause I lack the mathematical background for K&K's mechanics book. I think most standard first-year textbooks are like that...though I've read through bits of the 7th edition of Sears and Zermansky's 'University Physics' and liked their explanations better than Serway's text, short but clear (e.g. in Serway's book, the thermodynamics part wasn't clear at all, S&Z's text was shorter for that part but made much more sense)