I have and like the first edition. I don't have anything newer than what it covers, so it's fine for me. I use several manuals and websites off and on, but Zinn is one of the clearest. I use Park occasionally, and Glenn's and Cuthbertson each for my vintage stuff. With tough problems or where I need reference data (like BB or headset dimensions), I use Sutherland's and sometimes Barnett's.