I think the KING is for big guys. Their site has pretty good info. As per Ultimate site, King & Mid w/ back rest are going to be around $1100.00 delivered. Don't want to spend that kind of $$ and get a seat you're not happy with. A RDL is not quite that much, depending on type of material. Heated, custom or special work, will cost more. Of course there's wait but the RDL is built for "your butts" comfort. It's not as pretty & sleek as the Ultimate. I'm good on my Ultimate for a couple of hours. My other RDL's, good pretty much all day long, as the name implies, I'm sure my new one will be too. My only concern w/ the RDL in transit, it's on a CORBIN pan. If you ever took a CORBIN apart, you would see why they're hard. I find them very uncomfortable after 20-30 minutes BUT they are pretty. == That's my 5 cents worth.