I picked up some AT3s last week.
I took mine up a snowy, unpaved, unmaintained mountain pass to about 2400ft yesterday. They performed exceptionally, aired down to 8-10 psi in deep snow packed down by a couple of rigs in front of me. At one point, I had to back uphill for about 30-40 yards and they held up great.
The paved road leading up to this trail was slushy/icy and they did fine in 2wd. There was also an uphill solid ice curve on the unpaved part before we hit the deep snow, and it went right up.
All of the folks in the group were running toyota pickups or 4runners of various ages, all heavily modified for off road use, and I was meeting most of them for the first time. They were all amazed that my bone stock 3rd gen was handling it all so well. I kept hearing "I didn't think you'd make that". This was my first time doing this, ever, so I'm going to have to say that my AT3s (and a good 4runner) were mostly due the credit.
It's one day's experience in a certain set of conditions from a noob at snow wheeling, so take it as you will, but I wouldn't hesitate to recommend this tire to anyone for winter use!