I had (still have) a Vulcan 800 with a Mustang seat. It's definitely a great seat and beats the crap out of the stocker. I recently, well in May, bought a 1600 classic. IMHO I actually like the stock seat on it better than the Mustang on the 800. The Mustang was a little too firm for me. It may have to do with the difference in bike size though. I'm 6'3". The 800 never felt cramped until I stepped up.
Just my $.02.
Just my $.02.