I go 17' up with my hang on stand, the Summit Swiftree climbing stick is 17' so that is as high as I go. I just use a couple of screw in steps to get me up above the platform so I can step on it safely.
My climber goes up 20-25 feet usually depending on the tree.
I have shot deer from less than 10' up a tree so height isn' t a real concern for me.