This is a great book for either self-study, or even as a text for a (probably 2-3 semester) course on set theory. It is very useful to have a little bit of background of naive set theory (although the book does go through a terse introduction to this). It is a great introduction to independence proofs and forcing. I highly recommend it.Judging by some of the other reviews, it look like there may have been a printing that omitted some of the mathematical symbols. I ordered mine from Amazon several months ago, and it was fine.