As I've mentioned elsewhere I have the Nobsound spring footers, tried them under my Thiels.
I was blown away by the effect at first: the speakers just disappeared and soundstaged even better, a sense of distortion was reduced, more insight in to recording etc.
My main problem was it came with a lowering of dynamics, palpability, density and punch to the sound. It became more ghostly, more electrostatic. So I choose to generally not use the footers.
But the GOOD qualities from the experience intrigue me so much I want to try the Townshend bars, fingers crossed that it manages a best of both worlds - the speaker disappearing act but without the same hit on punch and dynamics. The Nobsound springs are a pretty crude take on spring isolation, whereas the Townshend are much more refined for their purpose.