Excellent shock for the price! Holds air, runs smooth, no complaints on the compression. The neg air chamber and rebound damping work well too. Although, like other reviews have noted, the rebound dial doesnt take effect until 4-5 clicks till the "slowest". Not really a prob, ya still got a couple good settings in there. I'll edit this review if I figure out how to change its effectiveness :)---- will it fit a hyper hydroform?My specialized was stolen, so I did the Walmart challenge on a hyper hydroform ($58 on clearance lol).This shock fits the mounts, with 0 modifications. The included bushings fit nearly perfect. Some nylon washers filled in the slight top bushing gap of like 1/16" per side (recommended). I opted for the 200mm AOY, as opposed to the stock 190mm found on the hydroform. This bumps the rear travel up a bit, and allows me to run a little less pressure (plush) since the cantilever angle is more linear (185lb rider). It's slightly diff Geometry unloaded, but ya got more play to compensate sag.Anyways, great shock. Wouldn't hesitate to buy another!