I may be an outlier here but I have tried isolation platforms under my speakers, more than one pair, and can't say that I have ever heard a noticeable improvement in sound. For me, it has always begged the question, if putting your speakers on platforms was the way to go, then why don't all the high end speakers come with isolation platforms from the factory?
@bigtwin I share your skepticism. Haven't tried the Townshends to be fair, but have tried ISOAcoustics Gaias - and it was simply a waste of time & money, here. Makes it hard to move speakers around, too. Others rave about them - especially paired to my Tannoys. I now use Herbie's gliders on some of my sets - not for sound quality improvements (becasue there is none I discern) but for the great convenience of being able to slide speakers easily.
But to each their own - I engage in many aspects of this hobby that read like pure Kool-aid / Snake Oil to many others.

