I had a Mustang on my 2000 UC and it was alway comfortable. When I got the 2012 FLHTK back last October, it had the Original seat and it seemed ok, but I was wanting something like the mustang again. I found and Bought a used Road Zeppelin off Ebay last week. Got it yesterday, installed and then took a ride for about 4 hours.....Should have done this sooner.....Great ride....
Anybody I know that has one loves it for the comfort factor. Just be careful with the vinyl as it seems to be a weak point. Have seen a few torn and or otherwise damaged.