Geoff should come on this thread and defend his product. At least with this one, its pretty clear how it works. At least as best I can tell. The only question would be the value compared to other isolation devices.
Isolation devices are a funny thing though, there is actually other products that might perform the same job as the MD offering claims to do. So it is at least possible to compare these to something else apples/apples unlike many MD offerings which seem to have been conceived more within the high end audio Twilight Zone where things become a bit more hazy, to put it politely.