Anybody know much about Von Schweiker speakers?

My dad bought some of his original Vortex Screens back in the late 80's when he lived in Ca. They are still amazing, amazing speakers and he loves them to death. They are a pretty interesting design because there is no cabinet for the speakers. They are suspended in a frame with no walls just covered by a thin fabric. The result is that the sound feels like it's coming from the entire wall rather than being projected by two boxes, giving the sound a larger then life feel. We've compared them to B&W 802's and notice that you can tell the sound is coming from a speaker with the 802's (rather then the entire wall). I've noticed none of his current models use this design.

My question is this: Why has he gone away from the cabinetless (I don't know what you call it)design and is there something inherently less desirable with it? Anybody know?