I'm just about to order a new 5-6" bike and the one I'm pretty set on comes in 26" or 650b. Since 650b is still so new, I can't really test ride any. I really don't like the feel of any 29ers I've tried but I don't want to order this bike in 26" and regret it in a year. I'm pretty sure 650 is gonna stick. It solves all the issues that people complain about with 29, while still giving some of the benefits. That, and just about every tire manufacture is on board. Once they invest in the molds, the tires will be here for awhile.