Out of curiosity I sprang for the IsoAcoustic Gaias for my speakers to compare them to my own isolation platforms. The Gaias do not completely isolate the speakers like my spring platforms but overall I thought the speakers sounded better with the Gaias. The accelerometer showed that the Gaia still isolates the speakers- just not as completely as my spring platforms.
That was my finding too, in my set up with my Thiel speakers on my wood floors (a rug overlaying the floor).
I use Townshend Seismic Isolation Pods under my turntable platform and they totally decouple from floor borne vibrations.
I tried the Townshend Seismic Speaker Bars under my speakers and they decoupled them very well, a bit 'too well' in that I felt I lost a bit of "room feel" for the music.
The Gaias I'm now using under the speakers split the difference: they isolate enough to get some gains in bass tightness and the speakers sounding more precise and "disappearing" but not totally at the expense of making the sound weightless.
I'm not 100% sure I'm keeping the Gaias under my speakers, I may yet end up preferring the speakers back on the floor, but for now they are staying.