Just picked up this new RSD "Boss" seat made by Mustang for my '18 SGS. A little firmer and narrower than stock, but I wanted that. Squishy stock seat actually gave me sore but & lower back after 30-45 min. So far I feel like I could go much longer on this one. plus, did I mention it looks cool? Changes the whole look of the bike i.m.o. I really like it. Only issue: It sits me back sever inches from stock. I am 5'7" with a 29" inseam. So now bit more reach to the 10" Yaffe bars, and I can use the highway pegs with heels on the floorboards, but can't comfortably reach to put feet directly on them. I like the seat so much though, I'm thinking about new 12" bars.