Im using a Summit Cobra this year and it never has slipped yet and I stand a lot, usually in the middle but was moving around a lot the first day to see if it would, and it held strong. It actually bites too well because when I try to come down the tree it bites into the bark so deep that I pull my feet out of the straps trying to lift it off the tree. I almost have to kick it to one side to get it to come loose. It is a very stable stand though.