I have an 05 with progressive air shocks bought it that way so i can't tell you the difference from stock. They go from 0-70 psi only need to run about 10 -20 single rider 25-45 two up depending on weight. I think they work ok but have nothing to compare it to. My weight is about 210 so they are strong. Had bike for two years no air leaks or any trouble with them so far and i think you can rebuild them if need be. Hope this helps a little.