06 K9 with almost 40K on it, and love it. Can easily ride 500 miles or more per day without a problem. But dig the Ridgeback too, especially the newer 330 model. But then again, I'm only 49 and have no back problems. Point is: they're both fantastic machines. Neither is a Cadillac cloud ride, to say the least; and both can be a beast to handle in a strong crosswind, but if you want a slightly smoother ride for longer hauls, I'd say go with the K9.