Hi Jethro:
I've got one. It has a 'unique feel', kind of hard to explain, but it is very comfortable. The company that makes them primarily serves the wheelchair market, trading under the name 'Roho". So, if you know someone who uses a wheelchair, or someone in rehabilitation or a similar health care activity, ask them for their opinion... the Airhawk for motorcycles is simply a Roho wheelchair cushion shaped for a motorcycle seat.
The trick is to not over-inflate the device. You add air to it (blowing into it), then you sit on it and let air OUT until your ischial tuberosity (butt-bone) just touches the seat. Then, you put one more breath into it and close the valve. The idea is that you want your butt to only be suspended the tiniest fraction of an inch above the motorcycle seat. If you inflate it correctly, it is supremely comfortable and lets you squirm around and change positions easily. If you over-inflate it, it's just an expensive balloon.
Michael