Agree with bxxer-rider, I ran a DHX air which would get hot enough to bake wet mud dry on the shock body on a 4 min run, on 10 min+ Alpine descents there is no doubt it was getting so hot that its performance was adversely affected. Its a brave statement to say that a negative spring makes the coil spring nearly obsolete. This is only true where the overall weight of a bike is of more importance than the performance of the suspension. When I see top flight Rally cars and MX bikes running coil free air suspension, I'll be ready to believe there is no compromise in performance.