Put new tires on this evening in preparation for the nor'easter.
I am very happy with the Pirelli MT-21's.
4000 miles, including trips to New Jersey and Vermont, and the front tire is severely cupped. I could probably get a few hundred more out of the rear tire, but didn't see any reason to push it. I will be keeping that tire as a back-up. I am going to try running higher pressure in the new front tire to see if that will help with the cupping.
Great off road performance, surprisingly good on pavement and 4000 miles on a big, powerful bike? What's not to like? I do believe I will stick with the MT-21's for awhile.