i've put over 20K on mine so far and have zero complaints.
out here, i see more mud and water than i do rocks, so, i can't say anything about how they crawl, but, i have been happy with them in my terrain. No particular issues on wet roads for me, and we don't see a ton of snow, but, in the couple of inches we get here, they haven't let me down.
the only thing i have noticed, and i don't know if it is the tires' fault, is that i have a hard time keeping them balanced. either i am throwing weights while in the mud, or they just don't like to stay balanced for very long.
i'll be getting them again when i move up in size, but, even after 20K, i still have a ton of tread left. not bad for 150 a piece...