I got a pair of these a few days ago, after a nightmarish trade-off between almost wipeouts v. pinch flats called victoria randonneur 26x1.5
Today I was finally able to take them to the dirt after a few days of just urban commute, so here are my first thoughts about it.
Rolling resistance: decent for such a tyre. The lower-profile centre helps it not to be too sluggish on tarmac. We had some heavy rain on the beginning of the week and strong sun on the second half of it, so some of the dirt roads felt baked-hard. It worked very smoothly on them, not too slower than the randonneurs.
On looser dirt/gravel/crushed limestone, it behaved quite well too. Rolled fast and cornered really safely, except on the tightest turns with very loose gravel, but then in no way I felt unsafe or that I couldn't get the bike make the turn as I wanted it to. Just a bit more of concentration than if I had used full-knob mtb tyres. And thousands of times better than my old randonneurs.
Weight: heavier than my randonneurs, but only when I held them in my hands. On the bike, I didn't notice it being heavier: then again, I'm using a steel frame.
Duration and puncture resistance: apparently both are high. I've skidded a bit more than what I'd like to (pesky traffic lights...) and yet the back wheel looks unscathered. Apparently puncture resistance is very high too (though not bomb-proof), but I'm not commenting on this yet.