I owned a 2003 Gen 5 and now have a 2023 Gen 6. The Gen 5 had much better weather protection, but I didn’t like it in the heat and humidity areas during the summer. Too much of a good thing. Gen 5 had a much higher top end speed. Gen 6 is governed to 112 mph ish (I’m told). Gen 6 is lighter, easier to handle moving around the garage and I get better fuel mileage. Gen 5 cupped out the front tires faster than the Gen 6 due to the additional weight the front tire carries. I like the cockpit better on the Gen 6, with adjustable windshield, Apple car play and better speakers. DCT makes for a very relaxing touring experience. A late model low mileage Gen 5 is a value buy, I’d say take both for a test ride and see what suits you.