I really liked the 6500, but I LOVE the 7520. It is so much easier to get on and off with the open platform. As far as handling, you really wouldn't know any difference between the two. I have very hilly ground and both the 6500 and the 7520 works well. I feel very safe on both. I do wear my seatbelt especially in some of the places I have been. I was pushing the limit, very dumb I know, but they are truly a workhorse.
Brian