Overall I think this is a very good supplement. If you love the Grippli race, you'll be very happy with their fleshed out history and the description of their society. The alternative racial traits, character traits and racial feats are all very fun as well.
I only have two complaints. First, the PDF needed a bit better editing, as some of the information on racial traits is a bit confusing and there are errors on some of the stats of the new grippli-specific equipment. Second, we were only given Favored Class Options for five of the classes. I would have like an option for every class. These are minor complaints though.
