I've also had no trouble with the Accushift on my Bridgestone. I'm running the GPX group, with a alpha 7 speed freewheel. I adjusted the RD setscrews per the instructions in the Suntour technical manual (
Suntour Technical Bulletin #21 "Accushift Problem Solving" in 31 Pages) and have had no problems since. The shifting clunk is comfortable, and I very much like the ability to shift several cogs in one go.