I think the CXN runner is just more rockered with less steel at the toe and heel. The flat portion of the blade will be the same as long as they are radiused the same. If you get too far over your toes or heels in your turns though, you may not be as stable as there is not as much steel there to support you. Personally, I like the rockered effect. When I got my last bauers I had some of the heel and toe material ground off as I felt like I was catching the toes of the blades on tighter turns and quick crossovers the first few times I skated on them.