I tried a Corbin on my 600rr and I hated it. It was hard as a rock, not an improvement, and expensive. It also seemed to pinch the battery (despite being custom made for the bike model) and kept causing the bike to randomly shut off regardless of speed. I took my stock seat to to a guy in Cincy that does the interiors of older cars. I have no idea what the place was called now, since it was many moons ago. He just added a shitload of high density foam and it has be a HUUUUUGE change. I'm probably going to have it done again next year, since the padding has broken down over the years. It's been in there four years now. Just my two cents and only a fraction of the cost. If you're handy, you could probably do it yourself.