2009 R3 here. I've ridden five years and 40k miles in the hills of the Appalachians, five years and 20k miles down south with the flatlanders. Now that I am semiretired, only get to ride half as much, but love the time with my grandsons.
Up North I came out of every curve hard on the throttle, passed every cager not going 5mph over the speed limit. I hit triple digits every time I rode more than 10 miles.
First tire at 3200 miles my rubber was paper thin. I could feel the belts. Second tire at about the same miles "thread bare", no rubber.
Switched to CT, never looked back. Loved it. Different, yeah. No slow down in the corners. I switched tires out at about 1200-1500 miles, based on age, not wear. Barely saw any tread wear.
I am commuter rider. Down here, no country roads to work, 15 miles with stop lights, hard right or left at intersections, no curves. The CT not good for those 5-10mph intersections. I switched back to MT. I now get 7000+ per rear tire. Still reasonable tread when I change, could easily get another 500+ if I wanted, maybe even 1000. No change in my riding style, but the roads are so different. Very few opportunities for rapid acceleration, which is what burns rubber. Nothing like pushing that Rocket through the secondary road blind curves, then a short straightaway before the next curve.
Up north, I felt much safer on the CT. At 2500 miles, thin tread was no joy. So I had 2000 miles comfortable, and another 1000 planning the the change, checking tread every day. With the CT, never a concern about tread wear. It never slowed me down in the twistes. Much different feel, but easy to get accustomed to.
I did the right thing when I was getting 3000 miles on a tire, and when my mileage more than doubled, and my riding was city/residential, I did the right thing going back to the MCT.
From what I have read, many Darksiders are unhappy with 6000 miles, so go darkside. I understand that.
From my reading, not many even try Darkside (only one BMW I have heard about). But of the ones that do, nearly all stay there. All makers of power cruisers have Darkside fans. That says something.