The Michelin ATs are not very good in rain or snow. Everyone that I know that has them here in the NW has complained about them. However, their life is very good.
I had BFG Rugged Trails and they were ok. They always got small rocks stuck in the tread blocks... always and it was annoying. They were ok in rain and snow. These rode nice and were very quiet, but I didn't like the tread design as I was worried about lack of water channelling... . It rains alot here :-laf
I replaced the BFGs with Bridgestone Revo Duellers and this is a great tire for ride and traction, but I've noticed approx 1mpg less fuel mileage compared to the BFGs. You can definately feel the "drag" on these, but they are quiet and the ride is great. Not noisy at all on the highway.
I should probably have gotten the new Michelin AT2's. These are just as long lasting as the AT's, but have a more aggressive tread design and are E rated like all of the above.
Hope this helps,
Louis