The PR4's were a comfortable tire. This was all on a 796, so may be different on the 1200 which I have now too (not the road 4's). I got 9k out of mine on the smaller, less powerful 796, which was disappointing considering that I heard numbers like 12k. But.. I do like to get into the twisties in north GA and find twisty roads around me at lunch too. Trustworthy in the wet, and aggressive enough for the twisties. Had no problem getting on their sides. Had maybe 1/4 to 1/2 inch strips on mine after aggressive riding, and this was my first "sporty" bike. Had to monitor air pressure on mine. Honestly, I need to test more tires to compare, but grip never let me down until near the end. Definitely started getting less trustworthy for the last 1000 miles, slipped a couple times in the wet in places where it shocked me. Was more conscious during this time, and drove the car more on wet days than I would have otherwise, until I replaced them.
I didn't like them over tar snakes, which I have a lot of on my commute. I was subconsciously aware of this, but after I switched to the Shinko Verge 2 which was completely unaffected by tar snakes, even when wet, I realized that had been a relatively conscious issue with the 4's bc I was always extra careful on them, especially when wet. I would think this would be more pronounced on a heavier, more powerful bike, but you'll have to report back.
Personally, I'm anxious to get the verge 2 on the 1200. It was much more agressive than the PR4's and should get much better mileage than the stock Pirellis as as well, as it's also a dual compound tire.
None of this is to say the PR4's weren't a great tire, they were, but like anything else, there were pros and cons, and for the price, you expect them to be perfect from beginning to end lol.