Unscientific Update
I've now put 2000mi/3200km on my Dunlop Trailmax Missions, front and rear. So far, I like them better than the OEM Battlax's that my D'Elle came with. On paper, they are among the heaviest tires, but there is a lot of rubber on these, and my analog butt-o-meter doesn't detect any loss of power. They have a slight hum on pavement, but it is not noticeable usually, only when you are listening for it.
I'm a 50-50 rider: 50% asphalt, 50% concrete

and some gravel and minimum maintenance roads thrown in. Out of the 2000 miles, so far I estimate ~12% was on unpaved roads; no single or two track trails and I did not air down. The tires are very predictable on gravel up to 1.5"/38mm diameter, even on downhill curves, and shallow stream crossings. I stopped and debated whether to walk it through a 100ft stream, but decided to stand up and throttle through. Arrow straight! There was 2 more such crossings on this particular road and I traversed the same way: stand up and throttle through.
In dry sand, not so good. For my experience level, I had my hands full trying to keep on a line and upright. I had to stop at one point to refocus and rest my pucker muscle. The Trailmax's have some well designed side lugs that bite into sand with minimal deeper digging. I took off from a standing start in soft, dry sand that was over my tire valves and she powered right out in Traction Control setting 1. Next time (?) I'll try airing down. I just got a neat little battery air pump to try out. But until then, I'm putting this 4.2 mile stretch of road on my GPS's avoid list! Back on the tarmac, they are a great tire. Very predictable right to the edge of the tread. Incidental pebbles in the apex or tar snakes upset them hardly at all.
I haven't had them in the rain yet, but from what I've experienced so far I would be very surprised if they were at all disappointing.
Kyle Bradshaw's
review is spot on, IMO. Exactly what I expected.