I’m very sceptical of these islotation devices indeed, as it depends on many factors like how inert the speakers are eg how they are braced and how stiff they are, how loud you listen as the effects will be more pronounced if listening louder, and how well the speakers are already spiked and that design. Also it depends on the size and weight of the speakers, size of drivers etc. I’m very sceptical too for the sake of the fact that with all these unknown variables in mind, and where floor interaction could be causative of poor effects to sq, which I’ve no doubt it could in certain situations, that they don’t design or supply better isolation with their speakers.