I just recently added an Airhawk to the Guzzi, after trying Saddleman gel pads, sheepskin covers, and WallyWorld waffle foam pads (not too bad actually). The Airhawk has made
by far the greatest noticeable difference, and is much more comfortable than all these others combined.
Having said that, though, it's still not a $700 Russell, Maund, etc seat. I decided to try the cheapest Airhawk I could find, which turned out to be a used one in great shape, with a patch kit, cover and straps, that I picked up on Ebay for 50 bucks. I'm very happy with it, at least until I win the lottery and can buy a "real" seat.
Motorcycle Consumer News (July '08 issue) tested a similar new product, though, that actually outperformed the Airhawk, with newer, more modern technology, better ergonomic design, etc. It's the "Freedom Air", from Star Cushion Products,
www.starcushion.com. I don't have a scanner, would be happy to copy and fax the test to you from work if you'd like. Both cushions are within a few bucks of each other, and if I was buying new would definitely try the new kid on the block. For now, though, I'm more than just a little  happy with my $50 Airhawk.  [smiley=thumbsup.gif]