I think some of you people are bias and go by what other people tell you, and therefore you go anf get that thing. I have 8x8s and my stock axle and the splines and in perfect condition. The axle is the same as the cannondale axle as far as splines. One problem was that the intergrated hub is long and therefor i needed to use a skinnier washer to make sure i can use a cotter key. They are the easiest rims to switch tires from, easiest to keep clean, and they hold air like some of the people who never had hipers say they do. My rims were out in my shed in freezing temps and they still are at 8 pounds of pressure. i just threw the piece inside the tire, threw the rings on, tightened them down and they are the best rims ever IMO, and ill never run anything else. Same goes for the razr mx's over holew00ters. So if you never had the product, shut up and don't bad mouth them.
PS. cancel the OMFs for and get the hipers, and do it now!