Comfort wise, the seat is great. I demoed one, and could see riding it 3-400 miles at a time, depending of course on the speeds and the wind. That was the only bad thing about it... At higher speeds you really had to hang on...
I could see it as my only bike if I lived in SoCal or the Rockies or someplace where the twisties are fairly close. As it is, I have to do a lot of droning to get to fun riding, which is why I have a Sprint...
FWIW, and all that stuff...
Dan