The last 5 sets of tires I put on my R1200RT were Shinko 009 Ravens.
I like them a lot, especially for the price. I normally got 7 - 8k miles on the rears and maybe another 1k from the fronts. I normally changed them as a set because the fronts tend (for me) to wear out on the sides. I imagine that if I spent most of my time on the highway, they would last much longer.
One thing I noticed personally, was that my RT wanted to fall into turns with the Ravens. It startled me the first time I pulled out of the drive on a set, and I thought I had made a mistake.
After I got used to the turn in, I found that I liked it up in the twisties. I tried a set of Michelin PR4s (I had used PR2s and 3s before), and found them sluggish after the Shinkos.
Once these "stock" tires are done, I will try the Ravens on the V1k.
My BMW friends turned their noses up at them (they can be tire snobs), but I never had any trouble keeping up with the "fast group" on them.
2007 BMW R1200RT (sold)
2017 Kawasaki V1K