I think the shiko's are a love them or hate them situation. I do not hear much middle ground. If you track or prefer a sport tire then this will not be the tire. I have many miles in the rain and have had no problems with the tire.
For me, I installed my second set last summer. It will be a neat comparison because shortly after changing them, I started mostly 2-up riding. Some of it with luggage for both of us.
The mileage I am posting is mostly me alone on weekends and out of town trips with me and luggage. I am about 140 lbs in riding gear. The front tire i got 17,887 miles before changing (could have run a bit longer but was going on a trip) and the rear I ran for 12,218 miles. The front seemed to wear fastest halfway between the center and the edges but that could be because I ran it for some period with not enough pressure. :spank:
I have attached pictures as well as a bonus of the two of us visiting some family. The new tire is mounted on the rim with air so it looks a lot bigger but they are the same size. Not being half flat also helps.