I took out a 650GS demo today while my 1200GS was having a service done. I wanted to ride an 800GS but no demo available here now. I rode over 100 miles with 12 of that on gravel. By 80 miles I had to take a lunch break because the seat was so hard. I also think the 650 was just too small for my 6'5 frame. It did feel good on the asphalt and nice an nimble. I sat on an 800GS with bar risers at the dealership when I returned and it felt much better. The 800 is just bigger all the way around. The ride home on my 1200 felt even better but it is still a big bike and not suited for all kinds of riding. I would still like to ride the 800 for a day. You have to spend some real seat time on any bike before plunking down your dough so it is nice that BMW will allow it.