Love It
For general riding, I don't use it, but on long rides, hell yes!
Two rides come to mind that I could not have done comfortably. One was my SS1000 Iron Butt. I'd hate to think of that without the Airhawk.
The other was simply a business trip where I took my bike instead of a car. 750 miles over two days and though I had had enough of riding and dealing with traffic, the airhawk was pleasure to have a long. Sometimes I'd put it back in the trunk for a different break, but it will always be my long distance companion.