I have the Elites. Before them, I had 20 year old MK Professionals that had very little, if any, rocker to them. I think they measured a 20 rocker (lol), because they were that flat! I love my Elites! I go about 100 hours between sharpenings. I do follow the manufacturer's recommendation and only sharpen with the wheel they recommend (which is a 5 hour round trip drive). It takes very little push for me to zoom to full speed with the Elites. These blades run fast on the ice. I've made some bad mistakes on the ice, but these blades catch me and saved my butt a few times. Yesterday, I was practicing my Silver MIF, and somehow decided to do a forward three turn on my heel. When I did turn, I thought for a second I was going down, but then the edge just gripped right in and I was saved. They are "louder" blades, and you will hear them biting into the ice more. But, I don't mind it because my cross rolls & power pulls sound awesome.
I didn't have trouble spinning in them (7' Professionals . . but Worn . . . to the upgraded 8'), but I am a good spinner. I think my spinning has improved alot in these blades. I've thrown down some awesome back spins, camel spins, and sit spins in them.
I had the money back guarantee, but it wasn't needed. Oh, I have them sharpened to a 1/2" hollow.