Fursona is very much a "What you see is what you get" addition to the Pathfinder Roleplaying System. If your group is filled with people who are hankering to play as a group of "Furries", then this is certainly the book you need to pick up. But I would not suggest this book to anyone who doesn't already have a need for it.
The writing is fairly clear, but the repeat sexual references (the book even uses the words "Yiff" and "Futanari" in a side bar! eep!) could have been left out altogether and would not have impacted the system at all. There are also many Group Traits that seem to add nothing to the character but show different styles of copulation while still costing points. I don't think that being sterile should have the same cost as a +8 in Skill Bonuses or a Bite Attack!
The base rulebuilding is rather alright, though some options seem overpowered (full attack after a charge with no penalty for a single point? Damage Reduction 2/Adamant for a single point?) and some options seem completely useless (Who would PAY to be sterile!?) There are also some interesting options for making Lovecraftian Abominations that should help create a few unnerving encounters, but calling the order "Lovecraftia" may have been a little blunt.
There are some options for replacing the standard races of the Pathfinder World with furry creatures of various types, but these are only helpful if your entire group simply HAS to play a game where nobody has fleshy pink skin and everyone has fur. The options for integrating them into the regular pathfinder world are the most likely used, since most groups will only have 'That one player' who wants to play an anthropomorphic character.
Finally there are the templates. Ranging from such logical things as a 'Queen Insect' or 'Feral Anthro' to mind-boggling choices like 'VG Sprite' and 'Earthborn.' That's right, you can play as yourself forced into a furry body, and one of the defining features is that you have 21st century knowledge in Pathfinder times. What was the author thinking!? That's something to be avoided, not encouraged! There's some cool options like being able to play as Redwall styled miniature animals, but it is far overshadowed by the weirder templates.
In summary, Fursona is a game that is very much 'By Furries, For Furries.' The very writing style and content of the book help perpetuate the sexual stereotypes of the furry fandom, but it also has enough rules to help a Dungeon Master out if they have a character that absolutely must play a bipedal nine-tail fox. Get it if you need it, avoid it if you don't. But if you do pick it up, be warned that you'll have to sift through the less desirable options built for the less desirable crowd in order to get the best out of your purchase.
Unless you're someone who must play as yourself in the pathfinder world 'tragically' stuck in the body of a nine-tailed fox who gains sexual-based diplomacy bonuses. In that case have at it; just please don't ever play at my table.
