+1 to most of what's been said. I'm one of those LD guys and have a Sunbrella w/vinyl sides RDL with about 40k on it. (no complaints, holding up well, but I'd probably go back to vinyl next time. The Sunbrella canvas stains over time and is more slippery than I really wanted.) Finished the IBR in '13 on that seat and I had a RDL on the FJR for 140k miles or so, (small squares, vinyl). Only reason I'm adding to the thread is that the only people I have every read or talked with that didn't like their RDL seats, were skinny guys with no butt.
I'm a fat guy, 240-260 w/o gear for the last 15 years or so, and have the heavyweight suspension in both RDLs. For big guys, there is no substitute. But for lighter guys, different foam densities work, and the RDL may be too much of a "tractor seat" to give comfort. Might be worth talking to Bill or Rocky Mayer too. For the lighter guys, under 225, they make good seats. If a customer comes to them over 225, they often just send them to Russell.