The reason we bought the Tri Glide is because my wife had broken her leg several years earlier and was no longer able to ride comfortably on the Heritage. Now when we ride together she has no problems mounting or dismounting the Tri-Glide. She is very pleased with the comfort of the passenger's saddle and is able to ride long distances without suffering any discomfort or pain in the leg that had been broken.
I find the saddle to be comfortable for short distances (fifty miles or so) when I have my feet on the floorboards and then not so much comfortable. But when riding long distances if I put my feet on the pedals I have mounted on the crash bars, then there is no problem and I can ride distances of over 200 miles in comfort.
The only other problem (?) I have found with the Tri Glide has to do more or less with the surface of the highway. As long as the roadway is smooth there is no problem with the ride, but if there are rough spots or multiple potholes (small ones) in the road, I find it almost impossible to keep from hitting them with at least one wheel and then the ride is similar to that of riding in a log truck.
I still like my Heritage the best, but for rides with my wife the Tri-Glide can't be beat, and it makes her happy and that is all that counts.