I have never seen any hard evidence that isolation platforms work. As far as I know, there is no study that has proven their effectiveness, and I have looked. Auralex has some vague charts on their website about their effectiveness, but they don't have any peer reviewed research paper, and that is really what would be needed. Yes, there are those who swear by their effectiveness, but there are also those who swear by the effectiveness of cable riser platforms- which goes to show you the worth of anecdotal evidence.