I have Gel on both, the HD & the BDM. Front and two up. My wife say's it made the difference in riding 2 hrs a day to 8 hrs a day. The Big Dog seat has also been cut down and the back support was cut into the seat, then the gel pad was added, then recovered with Alligator. Look at the pic's it is very noticable. Total cost $380.00. Makes 6-8 hr rides much more easier. The HD Ultra Classic, I had the seats front & back gel packed & recovered in Ostrich.