Interesting that it helps with your medical issues. I have the same thing happening with me. I have a very bad back, and when it is really acting up I can get on my FZ8 and ride for an hour or so. When done my back always feels better. Discussed it with my pain management doctor and she thinks that it is likely the vibrations. All I know is I don't want to switch to any other motorcycle with fear that the seating hurts my back. My FZ8 is the first motorcycle I owned. Before this I spent 6 years riding an Aprillia SR 50 that with upgraded performance. That was a lot of fun, but I got tired of not being able to go on the freeway, or fast roads. Got my FZ8 and have not ridden the scooter once since. Keeping it for friends to use so we can go riding together (well, as good as a scooter can do).