I still have my original Air Hawk cushion from either 2007 or '08.... its been through 3 2-wheelers, 2 Gold Wing trikes and now 1 Spyder. I LOVE it. Takes very LITTLE air or else its too bouncy and hard.
There is a similar product out there from a company called Wild Ass...
www.wild-ass.com... Actually, they bought the original Air Hawk people out, then they all got into some kind of legal squabble....now its 2 totally different companies with similar products.