This is a reasonably well-written, brisk romp through the Land of the Linnorm Kings and Irrisen. It's squarely aimed at fans of Paizo's Golarion campaign setting for the Pathfinder Roleplaying Game. It has a good mix of evocative description and transparency of mechanics - I never like RPG novels where the characters obviously can't be statted out as per the game they purport to come from - geeky I know, but it adds to my enjoyment when I can "see the stats" so to speak.
Most important of all - for a fantasy novel - it doesn't suck. I'm not a huge fan of fantasy novels, they're often over-long and turgid. This one is brisk, witty and has compelling characters. Props to the Authors for having good female characters who can kick ass and aren't caricatures.
If you like Pathfinder, this won't disappoint - it's not the most complex story in the world - but it is pacy and brings the setting alive.