I bought my "B" used w/ a Ultimate, It's a good seat. A couple hours before it starts to wear on me. As I type this Russell Day Long is building my butt it's own special personal seat. This will be my third, guess you could say I really like the RDL's, they're the best. I've also owned 2 Corbin's (1 new & 1 came on a bike) both were hard as a rock & made my butt, back & shoulders ache. Corbin is the worst M/C seat I've ever sat on. Don't know much about the others you mentioned. Dat's my 2 cents worth.