I had a great experience with Corbin as well, but "officially" they don't/won't make a seat for my bike 2002+ as the underseat changes make their current pan design unworkable. I've been in conversation with Mike Corbin to remedy this, but so far haven't been able to work out getting my bike or another as a donor for a week or so.
That said, I too went down personally and had them make the seat custom to my needs, and had a great experience. As Tim describes, one is assigned a technician that makes the seat from scratch, starting with the foundation. You are asked to sit and ride on the bare foam(except for a swatch of leather for the test) and modifications are made per your feedback.
Then you choose the material and any designs. The seat goes off to the stitchers, and an hour or so later it's ready for your final test run.
During all of this, they provide you with a free breakfast.
Although you technically need a reservation, my friend went down with me "crack-o-dawn" early on Saturday, and they said they pretty much always have open slots that early, and worked us right in.
Once all said and done, our original seats were shipped back to us fo rfree, and the new seats were great.
We were told several times that if we had any trouble with the seats, or wanted an adjustment after riding it for a while, just come back and they'd take care of it.
My friend on the VFR did just that when he found a fitment problem with his Givi bag setup. We rode down, and they took care of it, no appointment, and no charge or questions asked!
So, overall, a very good experience.
I've heard that some people have had less than ideal results from the mail-order versions, but then again these are "generic" per bike models... so perhaps that's not so surprising.
The moral? ...if you are interested in a Corbin seat, and live near one of their factory showrooms(Hollister, CA and Daytona, FL?) then take the time to go down and have your seat custom made. There really is no comparison.
Or as an alternative, I can highly recommend Rich Maund Cycle Upholstery in Virginia, for perhaps the best seats I've ever seen. He has a low-profile, and pretty much is only word-of-mouth since he's a one-man shop.
Here is one of his old projects(he's a huge sidecar fan, and teaches sidecar riding):
http://www.ural.com.au/Rich.html
Here is a recent seat:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2441144212
Here is a gallery of other seats he has made:
http://photos.yahoo.com/bc/rgmaund/lst?.dir=/Rich's+Seats!&.
He can be contacted at:
rmaund@pinn.net
al