I ran sportec M3s on my GSX-R back in the day. Actually, they were the first set of moto tires I ever paid for myself. I recall them being good, but not mind blowing or particularly long lasting. It just surprises me that you'd run those on a big bike like the K1200R on the street.
Right now, I'm getting about 4000 miles out of a sport touring front tire on the GT. I'd really like to extend that to 5 or 6K miles.