99 Critical Shots in Pool is a book I always recommend to players of every caliber, but I never ever offer to loan my copy. I don't want to have to replace it...
It actually costs less to produce my books in spiral bound than in saddle-stitch and perfect bound. It depends which company you use (I use Lulu Publishing). I have always found the spiral bound to be user friendly for players to take to the pool table, lay it out flat, and accurately recreate the diagrams.