Looks like rocky mountain charges about the same for both. I have heard good things about the razor2, I am hoping someone chimes in about the front Irazors though. And lap, get back to work, I know you at least have to look busy at your desk.
Razor 2's are good and durable, but not nearly as good traction wise as what the Irazor's are. The Holeshot HD's are good too, but that doesn't help your problem.
