I have researched this and all I could find were individual product reviews. On a general level, the obvious issue here is that these things don't move like conventional bags. I assume that one must recalibrate his footwork. Combo work has to be very different as well. Is it detrimental to technique, in your view? Standards combos like 1-2-3-2-switch kick will have to be done much differently on a thing like that, there is no swing so no getting into a rythm, no motion when the bag gets back at you to work on pivoting, etc... Thing is, I want to install a bag in my basement but am really reluctant to drill a hole, as the room in the basement is covered in nice decorative wood.