The standard floats have way too much compression damping. I've had good success having them revalved (with less compression). The Evols work very well, but on a mtn. sled, I like them near the lowest compression and rebound settings. Also you can get the Evols with high and low speed compression adjustment. With the dual air chambers you can have less air in the main chamber so it easier to roll the sled, and more air in the small chamber to resist bottoming. Most adjustable shock out there.