Yes Corbin seats are harder than most but (no pun intended), that's better than too soft and having it creep up the crack, if ya know what I mean.
I had a Corbin on my Duc (logged about 13K miles on that seat), best seat I ever had. A close second and maybe even tied with my Duc was my Corbin on my BMW K-bike (logged about 30K miles on that seat).
Now I bought a Corbin for my 2005 FeeJ and I'm not as impressed (so far about 5K miles on this seat). I feel like I keep sliding into the tank, and I'm in a down slope position. I don't care for that, but it's still far better than the stock seat especially after sitting for long periods of time. The stocker feels like my bumm is sitting on a 2x4 after a while.
I bought this Corbin brand new on ebay from a shop that they guy ordered it and never picked it up. I got it for less then half MSRP on a new seat.
All of the Corbin seats I've had no quality issues, they held together great, no abnormal wear, etc.
I expected better though from Corbin. I guess two out of three isn't too bad. I might try a different seat next time.