Great Book, I was extremely pleased to find it. The book overall is an interesting premise, and I'm sorry for the poster who feels it's not worth it because it's not another Grimtoothes traps. There are a lot of interesting setups, puzzles, traps, mini-adventures buily on EL, ranging from EL 1 and up. The challanges I read so far are for the most part very interesting, and pretty much adaptable and easy to change (keep premise, just change the special effect.)
I haven't finished reading it, when I do I will post a better review.