I originally bought the passenger seat for my wife, with the intent of keeping the stock driver's seat. The wife was so impressed with the ED passenger seat, that she "convinced" me to buy a seat for me (didn't take much).
I'm 5'-9", 185 lbs, 30" inseam - Mike recommended the Standard ED seat for me. To be honest, when I first put it on and went for a ride, I wasn't immediately convinced it was an improvement. Sitting lower meant that I was using different leg muscles to hold the bike up at a stop - more noticeable riding 2-up. In less than a week though, I found myself very happy with the seat, and the ED seats seem to work well with the Grasshopper backrest I already had with the stock seats.
I would definitely recommend ED to other R* owners. In fact, I have a co-worker who would be interested in the ED passenger seat, except he rides a Suzuki Boulevard - too bad for him - I guess he needs to upgrade to an R*!