Well, I have a treadmill and a pretty good quality one. It goes to 10 incline.
If you look at the Bowflex Treadclimber small print it says:
" Burns calories up to twice as fast as a treadmill at same speed with TreadClimber® intensity setting 12 and treadmill incline at 0 percent."
So, I am not sure it would really be worth the price for me. It also doesn't fold up like my treadmill does.