It took me a page or two to get used to the humor (I don't read much humor, need to fix that), after that I quite enjoyed myself through the book. I like the idea that you can have more or less soul, and that it affects you're creativiy/artisticness, and if you can successfully become an immortal.The book did leave me with some questions, which I hope will be answered later in the series, but it's nothing too big.
I'll excuse myself from trying to write more with the fact that I'm sick and can't think all that much at the moment.