Downloaded the preview. Got about halfway through before pulling out my credit card and buying the thing from Amazon. 
 A really quick, enjoyable read. Terrific urban fantasy (even with a few nibbles and flaws -- clearly a first or at least an early novel) that left me wanting more. 
 Loved the unusual magic system for both the protagonist and his friend. Two very low-powered-sounding skill sets in an overpowered world offered a great way to wow the reader with cleverness. 
 Off to buy and borrow the next four in the series.