I picked this up when I was reading Zen and the Art of Motorcycle Maintenance. I was really inspired by the romance of riding on the road and Zen really put you in the experience of being exposed to the world while riding.
This book is a pictorial along with quotes from bikers in all walks of life. It helped to break down the stereotypical biker for me, though I'm still not sure what percentage of bikers this represents.
Amazing pictures and some interesting quotes. I don't think it's worth a purchase unless you really enjoy biker photos, but definitely worth a library or bookstore perusal.