I have them on my Viper and I LOVE 'EM. I had a lot of flex in my boards [I wegh 275] and it eliminated it. They offer excellent traction and look really nice. You won't regret buying these.
I believe Rich at Rich MotorSports ran them last year and really liked them. I rode one sled with them last year and really liked them. I also recommend the flare kit as well if you like to sidehill or boondock at all.