Bowflex treadclimber Review

I like the bowflex treadclimber but I can't stay on it for very long. After about 10 minutes it starts to hurt my back. I think it's the awkwardness in which I'm standing. I try to stand straight but it still seems to hurt for some reason. I feel like I am hunched over. Also sometimes my foot slips off the tread and catches. I've almost fell from doing that especially when you are going at a high speed. It does give you a good burn and works the booty but I just wish I could stay on it longer. I'll work on it.