havocman may well be correct. The Townshend platforms seem quite credible, as pointed out they are three times the price of Gaia footers but may well outperform them. The point here is simply that the Gaia footers are credible and worth the price of admission.
I've run them on two pairs of floor standers with great affect. BTW, the carpet spikes used in conjunction with the footers provides even more improvement. Nice discussion.