Ask Fillo. I sat on his at the Kootenay Raid a couple years ago and it was about as comfortable as you'd expect. I think he said he was hurting when riding more than 200 miles in a day.
Now the Corbin, on the other hand... I've done 630+ miles in a day and my butt lived to tell the tale the next day. However, it doesn't look any better than stock (I didn't get any fancy materials).
