You set the rebound. Kinda like this the shock has two chambers. One side raises it with air. The other lowers it with air. so you can raise it up , then push it down with air , but you still have air in the other chamber creating rebound. My other airshock you could raise it up , but to lower it you had to dump air . But since you had no pressure it kept bottoming out.
Look at his website or go to YouTube.

 

$1250 is a lot of coin even though you guys swear by it. I can see doing it when all else is done.

 

Just bought some shotgun shocks today. Mentioned I read on here about a sale, and got them for $1350 shipped (since I believe that sale was only on until february).

Dealt directly with JD, really nice guy to deal with. Really excited to get these on my bike now.

 

You can't beat the look or feel of the SS shock. I love mine, and I have no doubt that you will love yours!