The only issue I ever had with a Corbin saddle was the one I had ordered for my Buell 1125R. That took MASSIVE modifications to fit (thanks to the great folks at American Sportbike for the technical assistance). The ones I had on my BMWs always fit perfectly from the start. Also, the saddle I had for my Buell M2 Cyclone fit perfectly from the beginning. Last saddle I purchased was the one for that POS BMW C650GT; probably the best thing about that scooter. It's the ONLY thing I miss about that thing, too. The saddle on my K1200LT is OEM stock and is probably the most comfortable saddle I've ever had. It is now 19 years old, and has been reupholstered twice in the 214,000 miles I've had it. Last time out I also had the good folks at Phoenix Upholstery (in Franklin Square, NY) refresh the foam too. I saw the saddle Corbin made for the bike and didn't like the way it looked so never got it.
One other thing about Corbins: They are NOT waterproof; they do not seal the seams. Although the foam inside is wrapped in plastic so they don't soak up water, the area between the cover and the foam can hold water for a VERY long time. Considering how often I've ridden my K1200LT in the rain, that was another BIG consideration of mine. I had a Corbin saddle on my 1985 K100, and I my crotch would get embarrassingly wet for DAYS after I had ridden in the rain with it.