I got a pair of Isoacoustic Gaia a while back for my speakers. I honestly couldn't hear any difference or improvement, but it looks kind of cool on my speakers so I just kept it.
One strange thing about these Gaia is that according to their installation instructions, the "isoacoustic" lettering must be facing forward. I think I even sent them an email asking about it, and they confirmed that is the recommendation for the best performance. I wonder if that's a marketing thing. Oh well.