I have a buddy that is cheap and buys Barskas and the such. Last deer season we were sitting in my heated box blind, and there was a really nice buck I told him to shoot. He took off his scope covers and the scope fogged over instantly. Needless to say, I laughed at him, and handed him my 308 with a Leupold Mark 4 on it. Dead buck shortly after I handed him the rifle.
The Barska was like looking through a paper towel tube with coke bottle glass on it, in my opinion, when it didn't fog over.
The cheapest scope I will buy is a Nikon Buckmaster, and for the $$$ I think they should/could sell for twice that.