Yea, I've had bad experiences with Walmart specials before.Viva 2 were the worst I've ever owned. I generally buy Coopers. I've had 4 or 5 sets and loved them all. I was going to buy Cooper STT but they were out of stock most places.
Most reviews for the Authoritys were great, wich i took with a grain of salt because they are on the cheaper side and most people who buy cheep things review them very high in a forum of self justification. However they don't seam cheaply made to me. Only time will tell.
We get some horrible winters here in upstate NY, Buffalo just got 8 feet in three days! And my explorer is not my daily driver, it's a toy. So I wanted something tough for off-road and virtually unstoppable in snow. With tread that deep I can't imagine these not being great in snow and mud the only question is if they are tough enough to resist puncture when on a trail.