Thread is a bit old but I just got Quad 0 on new steel in order to prolong my Supreme 7000's life until I get new skates. I expected one of two things 1) I would fall and have trouble adjusting 2) I wouldn't notice much. Neither. As soon as I stepped on the ice I was solid. I love the longer radius on the back of the blades! And as soon as you take off you are on the shorter radius and good to go. I think my old ones were radiused too short, but I can't remember what they were. When I started to tire out the front of my shins would get fatigued. Also, it always took 20 mins or so before the bottom of my feet would stop hurting, this has gone on for years. I always thought this was boot related but it didn't happen the other day for the first time in 20 years. Maybe my feet were fighting against the contour/pitch of my last profile. Anyway, I wasn't expecting it to be this different and it was, in nothing by a positive way.