I had a leather Badlander on my '03 Sportster. I'm not sure how similar it is to the Dyna version, but on the Sportster it was very firm, but comfortable for me. But for my wife riding behind me, it was horrible. I currently have an'05 Super Glide, and I find the stock seat very comfortable, and so does my wife. By the way, both bikes had (have) detachable sissy bars with backrests.