My priorities are a little different from those of this guy, I suppose. In quite an unclear manner he goes through his memories of Prog, choosing favourite albums and talking a great deal about Yes. If it's for newbies there isn't enough basic info; if it's for more expert readers I'd think there needs to be more on the music. A good overview of more modern Prog notwithstanding, it's difficult to see the intended audience. A diverting read for a couple of hours, though, and clearly a labour of love.