That's the Corbin Solo with small backrest. When I bought it it was too hard. Ran it for a few thousand miles and it never broke in. But Corbin "adjusted" it for free (long after the warranty was up) and it's been great ever since. On the way back from Prescott last May I did 638 miles in one day, from Richfield, UT, to home. I've tried sheepskin and my old Airhawk cushion and neither of them improve upon the comfort appreciably.
The only other caveat is that I had the backrest recovered once already because after many years of dragging my leg over the top, it wore away the leather. But it's great. I couldn't leave town without my backrest.
Edit: I think the biggest problem with Corbin stuff is people don't order direct so they can tailor the seat for you. I think I bought mine through Ma's Cycle or something. Also, I ordered the solo without the backrest initially and the little flap that covers the backrest hole doesn't have a hole in it, so the flap gets in the way with the backrest in. Looks better when the backrest is out, though.
If you're serious about spending the bank, look at Russell Day long and Mustang Seats. They have backrests that fold forward to make mounting and dismounting your ride easier (plus a lot of people swear by those brands).