i have just installed a wellfloat platform ($260 USD on ebay). it is around a4 sized and is lowest model available.
the issue i wanted to address was the motor drive for my turntable. it is noisy. creating a real mechanical chatter. i have it on my cabinet and the tt is also on the cabinet along with everything else. i had tried other ways to try and prevent drive noise entering cabinet. i was using Gaia (3) feet with a granite slab and CMS footers. this was good but not perfect.
the wellfloat alone is quite perfect. it has done a brilliant job of stopping mechanical noise getting into the cabinet. shockingly effective really. well worth a look. very different to something like a CMS footer which to me is more about acting as a "drain" for a component (i have no idea how that works but i do find them very effective).
for real mechanical vibration noise, such as a motor produces, i doubt the wellfloat can be beat. EVP blocks had too much give and didn't sound great. Gaia good but not as good as wellfloat, no where near it really.
i am very curious to try wellfloat on other things (i would love a double for my turntable) but am also not keen to put so many dollars into a platform when the table itself was ~ 8k USD or so.