MT/R's suck in the mud from what I've seen here in the midwest. Overpriced and overrated.
Reason they're so expensive, they were released when the market was ripe for a new MT and the hype was high. Prices have never really come down much on them.
I've seen them wear pretty fast on the road too, I wouldn't buy them for miles. The same soft compound that helps in the rocks, hurts the mileage.