The book has some really useful stuff in it.
Races : The races presented are relatively balanced, and while I probably won't use the Rat-kin in my game, the Half-Ogre is pretty decent, and I could see allowing them in.
Classes : The swashbuckler class is, honestly, the best swashbuckler take I've seen. Honestly, it's a really really good class. Unfortunately, the rest of the classes are just 'meh' (for example, the Knight is ok, but I prefer the old WoTC Knight) or just too complex to use (the new artificer for example).
Chase Rules : Not a lot I'll actually use, but they seem very detailed and relatively easy to use. Good if you like that.
Alchemical Items : Probably my favorite thing in the book, really. These are great, and add a lot to your game. None are overpowered, and they all have some utility use. Great addition!
Million Items : Ok, I have to be honest, the rest of the book is pretty good or at least average. This thing however, is seriously broken. I mean really really really broken. Stay away from it.
Monster Mods : These are pretty good as well, a good way for GM's to keep things a surprise for the players. The GM will have to be careful of course, some of the random tables can generate some really powerful monsters out of range of the characters. If you use it, I suggest picking modifiers instead of randomizing.