Just received "The Essential Buyer's Guide for 2-Valve Big Twins " by Ian Falloon from Amazon. Severely disappointed. It's small, 6" x 8" and only 64 pages and the content seems directed to someone buying a used bike for the first time. Not a lot of model and year specifics and because of the small size, the pictures don't give much detail. The 850T-3-4, Convert, G5 and SP1000 rated a total of 2 paragraphs and 3 small pics. As much respect as I have for Ian Falloon, I really can't recommend this booklet.