Riding a WR250R
Coming from the MT-21 front, the XCMH is a huge improvement off-road. I've only ridden on it once at a dual-sport ride. 181 miles of mostly technical single track consisting of rocky terrain with 30+ creek crossings, some roots, muddy ruts, etc. I ran this tire at 9psi ( with Tubliss ) and it performed very well.
Time will tell how long this tire will last, but for the riding I do, I'm more concerned with traction than longevity.
Riding a WR250R.
I'm on my second XCMH rear tire. I ran a d606 before that. I've been very happy with this tire. I'm running Tubliss with this tire and have found that 6psi works very well in technical single track.
I just got back from a 181 mile dual-sport ride that consisted of mostly rocky terrain with 30+ creek crossings, roots, muddy ruts, etc. I spooned on this tire just before this ride. I never had any issues with traction during this ride.
The XCMH won't last as long as a d606, but the XCMH will definitely provide better traction. It is a more aggressive intermediate terrain tire where the d606 is a hard terrain tire.
I bought the Pirelli Scorpions for my Honda XR650L. They provide great traction and a smooth ride if you mostly ride on the road, as I do. I only got a little over 3000 miles out of my last rear Scorpion, but it is understandable for the way I ride it. I liked it so well that I replaced it with another one from Motorcycle Superstore.
I use this on my dual sport and is the best tire. I ride with a lot of guys who use knobbies only, and it blows their mind when in traverse areas they struggle to find traction. Works great everywhere, including sand. It does struggle in thick clay mud, though. Just wish I could get more mileage out of it. 600 miles is about all I can get, but it never chunks.