well the guy that built my banshee motor was telling me about it, he said that it works pretty well and they have gotten the machining down pat, he said that they are holding together all the way up to 11,500rpm. which is a good thing.he knows his stuff, but i just thought i would ask around before going ahead with it. he has a machine shop that does all his work for him. i can get the details and let you guys know about it, if you want.