PM Live2Ride, he has one on his bike. There's another guy in Germany or the UK, but I can't remember his screen name right now.
Think they said it looks nice, but its a little hard after the stocker, big surprise.
Haven't had anyone on the back for a long ride, but for a short ride she said it was comfy. I have made a 250 mile ride twice now, and I love it. Most comfortable seat I've ever had.
I have the retro seat on my 07. I like the way it makes the bike feel lower and sleeker. It is okay for normal riding, but I don't know if I would go on a cross country trip with it. It is not as comfortable as the lazy-e-boy that came on the bike. My wife doesn't care for it, but she doesn't ride much and it only takes a few minutes to swap it out.