Seriously, lots of crap out there for BIG bucks. I've had excellent results by simply placing a common brick (not the silly VPI one) on top of each component, with felt pads in between to prevent scratching.
More cones?
Just read another new review of isolation accessories. It seems like every other review is about isolation and it is getting to be a bit much. I think audio components can vibrate and this can potentialy effect the sound. I also agree different products can reduce or eliminate vibration to various degrees. I use a modestly priced solution myself. (I think I hear a difference). When I start reading different materials of cones are changing the character of the sound it is getting a little ridiculous. eg. "Glass shelves make my system sound hard and rubber makes it sound soft". Also the benefits most often heralded of good isolation is a tightening of the bass. Yet why do so many subwoofer companys mount the amps and crossover right on the cabinet!??!