From my research, I think it is impossible to beat the Ultimate, but have heard a lot of good things about Mustang as well. I currently ride a modified Mean City Cycle seat, and it alone is 300% better than the stock seat. I'm currently looking for an Ultimate for me, but I think my wife is hoping that I find one,,,,,, for HER!!!! Good luck with the search.
2007 1800T, Memphis Shades 21", Kury Engine Bar & Pegs, HondaLine Light Bar, Ultimate Seats, Cobra Slash-Cuts, Progressive 430 Shocks & Springs, HondaLine Saddlebags, Iron Horse Tail Bag, Fender Rail, Color-Matched Radiator Housing, Show Chrome Fringe, Kury Iso-Grips, Custom Breather Cover. GO TEAM DREW!!!