Have any of you had a chance to use one? I am getting a demo on one soon and am really excited! My hope is that I can almost replace my 21's. I know that in most places we will be able to but we have some hills that I think may be a struggle for the Pro Stance unless the walk behind mode works really well. Does anyone have feedback on this? How is the QOC? If you had the choice would you go with a 36" stander or a 36" walkbehind?