For years I laughed at folks spending money on replacing prefectly good seats - I have had a lot of BMWs including several air heads, Ks, even F but never had any problems with seats before - sure some are better that others. But never felt like getting my wallet out to replace a seat.
My Rockster bought new a couple of months ago was good for 30 mile days - it killed me - don't tell anyone but I actaully went to the doctor (first time in ten years!) it seems the Rockster had given me piles!! (too much information) and I thought you only got those from sitting on cold concrete - in my opinion that descibes the Rockster seat down to a 'T'.
So, lots of research, lots of money - I bought a Sargent front & rear at the National Rally in Vermont...........I CAN NOT BELIEVE THE DIFFERENCE, IT IS A NEW BIKE, it even helps with knees, seams as though the extra support from the seat does more than just cossett ones' bum! Not only that but I was also having trouble with my tale bone - not any more!
So, if you are thinking that your Rockster seat is a bit on the rough side - have a look at a Sargent.