I had it printed and bound yesterday and have been reading it today. It is awesome and I have no doubt it will outsell MMS:WE and MS:E&C in time. I hope to see addendums from time to time for sale.
There is only one thing that bugs me. In the intro it mentions how it is the first book on customizing monsters. Uh, no. FFG's Monster's Handbook came out in 2002 and stretching the parameters of customizing a bit, Silverthorne's Book of Templates (Deluxe Edition) came out in 2003 (it has very good sections on using templates and some on customizing them). BB is much better than MH and is more flexable than BoT(DE), but it came later.
It is like the intro to IKCG where they stated that a setting without dwarves and elves isn't worth it's salt. Broad statements like that just annoy the hell out of me. This isn't a put down, just an observation.