I have been using the Pirelli Angel GT tires for about four years; the traction in wet, dry and bad pavement are great. I'm not a brand loyal buyer and will change if I felt there was something better out there but I believe this to be the best tire available for my purposes.
I have an 2001 RoadKing with a Hillside Cycles motor, Baker 6speed and the Glide Pro handling package. I regularly grind the floorboard mounts. Started with Dunlops, they handled decently, sucked in the rain and wore pretty good though. Next were Metzlers, did everything all right, but never felt comfortable digging in to turns with them. Venoms were serious fun but they wear. In 2 years I went through 2 fronts and 3 rears. Then it was the Night Dragons. They handle as well if not better than the Venoms, rain is the best of all and they wore better than the Metzlers,but not as good as the Dunlops. For a Tire this STICKY, I think that's amazing!
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.