This is a very good product and I definitely feel I got more than my money's worth. It's well laid out with an easy to read font with quality drawings, and as a bonus it includes stats for 0e,1e and BX variations. It has drawings for nearly all of the monsters (so far only found 1 missing), which helps a great deal when quickly scanning all the unfamiliar creatures and you are looking for just the right one.
I do wish publishers would include an index based on HD or challenge rating or similar to help the poor DM quickly find an appropriate monster, but hunting through the book is fun and really not a chore.
As a point of interest, I came back to pay for this because I thought maybe I had "paid what I want" of $0 to preview it first, but found I had bought it and decided to review it instead. Now I want a print copy.
[5 of 5 Stars!]