I've had the chance to put some miles on the Airhawk the last few weeks. It took a few rides to get used to it, and to get it inflated correctly...I over-inflated it initially. Sitting on it felt kind of mushy and unsettling until I got used to it...now, it feels fine as soon as I sit on it. I still get "numbbutt" on longer rides, but it definitely takes longer to hit me w/ the Airhawk. Last week, I took it off since I knew I'd just be riding around town. I was surprised at how quickly the seat felt uncomfortable without the pad. I suppose that's a pretty good indication of how it feels. Anyway, I definitely would recommend the Airhawk as a fairly cheap improvement for the stock seat. (I've never sat on a Corbin or any other non-stock seats, so can't compare it to those more-expensive options).
Will