How are those Hurcules Trail Diggers holding up? I have about 52,000 on my Duratracs and have considered going with a few different tires but am afraid I'll just compare whatever I buy to the Duratracs. They're not cheap but I'm amazed that I've gotten as many miles as I have out of such an agressive tire. Will need new sneaks before the snow flies this year but I plowed a LOT of snow last year with 45,000 mile Duratracs. Just great tires...