...for those with a lot of slick highway driving experience with one...
I know they'll get you going and keep you going, but how are they for icy highways? Will it break both rear wheels free and skid you more than an open diff? Can they be more of a liability than an asset on ice?

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.