A excellent expansion to the Pathfinder Summoner class, plus expanded options and a worksheet for creating the Summoner's Eidolon. The 30 new feats include some that have a strong caveat for the GM (Cannibalstic Casting, for example, should probably not be allowed for Summoners who can recover Constitution easily).
The layout and art are very good, and other than a few small typos, the text is clear and well written. Used responsibly, this supplement can add a lot of variety and enjoyment of the Summoner class in your Pathfinder campaign.
[4 of 5 Stars!]