I have a friend who runs these radials and he is not impressed. He gets no longer life out of them and they wear unevenly. A couple of them have worn smooth for about 15" while there is still tread elsewhere. Backup was nonexistant.
We travelled together for about 1,500 miles on our recent National Rally and he had 3 flats. An inspection of the inside of the tyres showed why. They are VERY rough and lumpy.
I'm in no hurry to buy a set any more!