@halecory, some listeners (Robert Deutsch and Art Dudley in Stereophile, VPI's Harry Weisfeld) have been very impressed with the IsoAcoustic Gaia isolators, many of the UK reviewers are enthusiastic about the Townshend Audio Seismic products, and Audiogon's own Geoff Kait offers two different versions of his isolation springs.
The notion of cones and spikes being mechanical diodes (passing energy only one way) is obviously a myth. For proof, go onto You Tube and watch the short videos wherein Max Townshend demonstrates the difference between the same speaker spiked to a cement floor, and isolated from it with his Seismic platform.