Townshend Springs under Speakers

Seems to me, when it comes to Vandersteen loudspeakers, the best advice comes from Richard Vandersteen. He's a very thorough designer.

If a Vandersteen owner reports results using Townshend podiums, then that will offer some further insight.

Until then, I'd go with RV.

Until you put his speakers on Podiums, and hear the profound improvement. Okay maybe not even then. But those still open to learning and with a desire for better sounding systems regardless of what else it might imply, those people will definitely hear it and be happy and want it.

Read actual user comments. Wobbly floors, solid floors, concrete floors, does not matter.

The physics is the same regardless of the speaker manufacturer.  My experience with spikes vs. decoupling (using Herbies products and later springs) led me to believe in the benefit of decoupling on both suspended wood floors and on grade-supported concrete slabs.  The effect of decoupling/springs could be different and/or more substantial for speakers supported on suspended floors than for those supported on concrete, but IME it is the better performing option as discussed by @oldhvymec below. 

That's what I thought.