The want to spend money on an unknown product and one not commented on as a solution does present as being quite dismissive of the assistance on offer.
Gaia Footers do work and so does the Townsend Podiums. I can vouch on these as my Loaned out AT 616 Feet used as Footers on Speakers assisted others in their making a decision about Isolating a Speaker.
I would say between the three footers referred to above, there will be very little differences detected in their effect on the end sound of a Speaker. Cost of the Footers will be the deciding factor if all three were assessed side by side.
There are very cost effective ways to experience a Pneumatic Footer, which will offer almost the same / the same effect as the above.
Make a Design for a Sub-Plinth using a Sand Box with a extended Skirt to conceal the items in the Link, which should be produced to a very pleasing aesthetic finish if done DIY for no more than $100 and this will compete with any $1000 suspension device on offer as a Sub-Plinth.