I hd a pro with my 1st Rev,..like 3 years ago. Bad NEG air spring,.that's all. And it was on my 1st,.a 426 Air U-Turn. That was an '09 fork. I also have a 2010 Rev Team (it's on me SX) and now I have the RLT-Ti 120-150 Dual Position Air. They've saved my ass several times on rogh stuff when I was REALLY cookin'. It gives you a sort of "fudge factor" and allows you to suck up whatever the trail or ROUGH throws at you. I'm a "Manipoo" convert