Inner Sea Races expanded?

Paizo has hit another home run with the this add-on book for Pathfinder.  I did not buy Inner Sea Races as quickly as I normally buy Hardcover Pathfinder books because I believed that it would just cover a lot of the races on their world of Golarion.  But, I got an extended look at it in my local BAM, and decided to get it.  I was not disappointed!  This book takes the races we already know and love (heck, such as Humans, for instance) and breaks them down much further.  Humans can be created in 12 different types based on the tribe that they are from!  There are many other examples.  Including the now expanded Humans, this book covers 37 races rather thoroughly, and also has a few other smaller entries.  I particularly like the Catfolk - because I have a regular player that would make one up as soon as I told them Catfolk were acceptable.  In fact, this book pleased me so well that I went out and got the 'companion' volume - "Inner Sea Gods". A good GM, of course, should take a look at the races that are presented and make sure that they would "fit" into their campaign.  This book has my recommendation for any GM using Pathfinder.