Had a friend who is sponsored B-group driver using these for awhile. He really liked them alot, but ended up having to go back to AE shocks when AE got wind he was using them. I'm sitting back and waiting for an official release from AE. I havent really had any problem with the stock shocks or springs. Only modification was to put in the low friction clear Kyosho o-rings, smoothest the shocks have ever been. I have seen the AE prototypes at OC/RC when Steve Hartson is testing them, and they look really nice, very much like Kyosho shocks, but hopefully not nearly as expensive.