I read the book and gave it to a friend after I finished reading it because I knew I wouldn't want to read it again. I enjoyed the first half to 2/3rds of the book primarily because, as MG has noted, Mr. Love tells a lot of great stories and it does give a lot of insight into what goes into being a working musician.
As the book went on though, Preston's bitterness in his later life and his personal agendas spoiled the feeling of the book for me. Basically, I felt that Mr. Love became bitter, angry and opinionated as he became more financially successful, and that left a bad taste in my mouth. Perhaps I should have relished the first half of the book and let the last part go, but I wasn't able to do that.
Incidentally, my friend felt pretty much the same as I did when he read it.