I worked through all of the problems in the book. Based on my cursory assessment of other treatments of the subject, I think that the book gives one of the best treatments of axiomatic set theory that I've seen. I saw another reviewer pay special attention to the fact that the book uses a simplifying assumption, a special axiom for cardinals, to develop a cardinal arithmetic, which would ordinarily be much more complicated in its initial stages than the comparable development of ordinal arithmetic. I believe that the author later justifies the axiom with the Axiom of Choice. While a development of cardinal arithmetic independent of the Axiom of Choice and based on the rank of a set might be more intellectually parsimonious, since the Axiom of Choice is necessary to prove basic claims like the claim that the product of an infinite collection of non-empty sets is non-empty, as far as I'm concerned, the development is sufficiently rigorous and satisfying.