You didn't mention the year of the RS Stu.
As for comfort, well have you much experience with a sport bike? Your legs are gonna be cramped and you'll be leaning forward from the waist, thus putting pressure on your wrists and hands until you can develop the muscles in your abdomen, back and inner thighs. If you're in good physical shape and have well toned muscles you should be okay for 100 mile jaunts. In all honesty the Sprints are not the most comfortable bike for passengers.
They are a hell of a lot of fun to ride though and they're about the best sportbike option for us geezers.
