I've hunted pretty extensively out of my Summit Viper climber. It's not the easiest to work with but it allows the utmost in mobility. I've shot two deer and a turkey while hunting out of it. Usually I can get about 180 degrees of shooting, depending on the tree.
If you don't have a good solid upper bar that you can lean against, I think it would be tough, depending on how high it was. I setup my climber so that it's at my thighs or so. That allows me to lean against it and out to where my bow doesn't come near the lower platform. I shoot a 52" longbow out of mine.