Burton also had a problem with the C60 highback last year. Many of the riders who actually took them to the limit broke the highback serveral times. Last time i was at a shop i was looking at the C60's. They don't actually feel as stiff as a Ride SPi at all. They seem to flex ALOT for supposidly being really stiff.
I have the 07 Ride SPi's. I wanna get on them real bad. I have 05 Burton P1's, which i took the super, and cap straps off, and fitted them to my SPi's.
If burton does one thing right about bindings, they know how to make really comfortable straps.