I have two lower discs fused in my back and have found that the backrest on the Ultra removed 90% of all discomfort.
My problem is monkey butt!! Can't make it past 200 miles without hurting. Have added bicycle pants and they help, but not enough.
Tuesday, I'm taking a day of vacation and riding to Ride & Leather in Jonesboro, IN. They will remove my seat, carefully cut open the leather cover and replace the guts with gel honey comb layers and special felt top layer. They then resew the original cover back on. Ride & Leather claims to have restuffed over 300 seats with no comebacks. I sat on an Ultra Seat during last week's ride that a new found friend of mine had installed on his ride. Sure did feel good. and at $120 about 1/4 of the cost of a Mustang or Sundowner seat
I'll let you know how it feels later this week