I've run PR1's, anakee 2's, K60 Scouts, Mitas e-07 and Roadtec 01.
My favourite was Anakee 2's. They suited the bike. A little bit of ability off tarmac roads but didn't take them far off road. 10k on my k6 wee.
Same sort of mileage with the PR1's and the bike felt like it was on rails, didn't quite look right on the bike though being a full road tyre. But that's a personal thing.
The K60's were usable offroad until things got very muddy. Stable but not as sure footed when pushed like the Anakee 2. Mileage was around 8-9k rear.
Mitas e07's were about the same.
The roadtec 01 are not something I will be fitting again. Have squared off and worn oddly on the rear to a point it makes the bike unstable when holding a straight line on straight roads. Wet grip was fantastic, but not worth the trade off. Rear is on 6k and will be replaced very soon as the rear is nearly on the wear bars.
I have a set of A40's sitting in work ready to fit when the workshop is quiet. These get some very good reviews from our customers and are reasonably priced.