In my case, I _had_ to do something with my 400 seat, as it was not just uncomfortable but intolerably painful on rides over about 45 minutes. Since I bought the thing in part to take long trips on, well, something had to give. The pain was right at the base of my spine, on the tailbone, at a spot where I determined the factory seat has only a tiny fraction of an inch of padding.
At first, I tried cheap solotions. I'd just spent more than I really cared to on the scoot, so cheap was foremost in my mind just then. I went to Wal-Mart and bought a square of foam rubber for $1.47; it looked like hell but made me feel better. Still, it was not enough. So, I priced a Corbin seat, left the webiste screaming in pain, and commenced researching. After literally _weeks_ of study, I determined that if anything short of a Corbin was going to work, the AirHawk seat cushion for a cool $150 or so would. Sure, I wanted to pay less. But, I reasoned, the AirHawk was a sure thing.
It wasn't. Though it definitely made things better, it became very clear very quickly that the problem was inherent in a flawed seat design, one that the engineers had botched so badly that even modern high-tech seat-cushion design could not make up the difference. So, finally, I bit a most unwelcome bullet and bought a Corbin, paying over 10% of the cost of a new bike for the privilege. I've not been able to ride a whole lot since, but the Corbin appears to work. At least for me.
At that price, it **** well _should_.
You may wish to check out the 400 Corbin Seat thread in "Accessories" at
http://burgmanusa.com/forums/viewtopic.php?t=3451