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Everything here is killer and not superficial BS filler. You get monsters with flavor & old school gravitas like the bone creeper below here. There are conversion notes for using these horrors for "Original Fantasy Rules" but lots of conversion notes are given for OSRIC and Basic Fantasy. There are also some conversion notes for Nite Owl Workshop's other games Colonial Troopers, Guardians and Warriors of the Red Planet. Why can't other OSR products do this to save dungeon masters like me who don't have time to do conversions notes like this. It saves a ton of time!
The monsters have just enough flavor without overwhelming their placement in your old school campaigns. Artwork & layout are top notch, Nite Owl doesn't do Kickstarters or other BS, the artist, his crew, simply release the product. This is one of those products whose contents have been released under the OGL open game content and some of these monsters would make unique boss monsters for ruins or hex crawls. The quality is right on the high side of what I'm looking for my own campaign. The maps are very well done as one would expect from an artist whose work appeared during the D20 boom. The work here is top draw with all of the monsters getting an illustration & a good set of stats. The maps are well done too with a flying megdungeon of doom dominating the later half of the book. You get a cutaway map job like this one as well that can provide yet another setting option for WoRP or OD&D style games.
Beasties is a great book & an excellent resource given what you get for your money & the investment of time. All in all I think its really well done OSR product and one that I'd love to see more of its like on the market. This is a good product for a wide array of OSR games and it fills its niche very nicely. Five out of five in my humble opinion.