I got this book as a present from one of my UT buddies; needless to say, I have a bit of an advantage over him :-) The book is most useful when it shows you the secrets of all the levels; some are really devilish to find, but really cool. It doesn't cover any of the recently released levels, and I kind of wish that they had a corresponding webpage where they covered the new levels and the like. The rest of the information about the levels was a little bit confusing, but if you glance at the book while playing a level, you should be ok. The stategies they presented were very good, but most of them can be found on UT websites. Some of the information was a little bit off, but I didn't trip over it much. Overall, the book is well worth it.