I have a Corbin seat, but it is on my Kawasaki Concours, not my R65LS.
It is a well made, all leather surface seat with alot of room. It is also wider than the stock seat and about as soft as a park bench. The factory seat on the Concours (I have a 1998 model) looks good and is pretty comfy for about 150 miles, but after that the foam slowly lets you down, and by the end of a couple 500 mile days you fill like your sitting in a bean bag but all the beans have come out from under your butt, and you're hip bones are setting on the hard seat pan. The Corbin is too firm for some folks, but it does easily let you move around, so that you don't develop "hot spots". It does take some getting used to, and its wideness also decreases how much leg length you have to reach the ground.
I don't know if the R65-fitment saddles would be very similar, but I think that their general philosophy about seat design is similar.
I have a stock R65LS seat on my bike, which I've recovered, but so far am still using the stock foam in it.