A great deal depends on how your speakers are designed. My 180lb Wilsons and their rock dead cabinets are meant to be on spikes, not suspended to vibrate. Spent some cash on Stillpoints (more expensive than GAIA) and found I didn't care for the sound. Bought Wilson's oversized spikes and diodes, a nice change. Use the Stillpoints and IsoAccoutics under equipment now.
Inside the Iso Acoustics mechanism
So what us inside the device? Springs? Dampening material or a combination? Thanks