I had the qsnap floor frame. Loved that it was light and portable, and that it was easy to snap the quilt in and out of it. It was also easy to take apart for storage and put back together again for use. My back did not like it, however, even when the back was propped up so the surface was tilted. I do much better with a swivelling lap hoop because I can keep my back straight.
Also tried the smaller qsnap frames (the non-floor type). They were okay, but had the same problem for me that any plain hoop has -- making me feel as if I really needed 3 hands: 2 to quilt, and 1 to hold the hoop. Again, my lap hoop takes care of that problem for me.