Zak,
I have the stands, as I too can't hang my QS8's for now. I find them to be just fine. I do have mine up against the side walls of my place, and so they don't see any action as far as people bumping them, but I have never felt like they were unstable. I think if you anticipated that at all the rubber balls would probably help greatly to stabilize them and keep them from rocking. I just reached over and wobbled one, and with a small amount of force they wobble, but I don't think that they would go down too easily. The speakers on top of them however are completely stable with the stand, I don't have ANY worries of them falling off ever.
