What do you use for isolation?

I would say a combination. I have mdf and maple shelves/platforms. Audio Points, Valid Points, Vibrapods, Symposium platforms, etc. In fact I just ordered a couple pair of these Wai puna Sound Myrtlefeet tonight. They look intruiging, and the price seems right.
In the end, it's whatever works for you.

Cheers,
John

All Herbie's stuff. Big Fat Dots under the speakers, Tenderfoots under the CD & Iso-Cups w/Ruby balls under the amp. I've used spikes, myrtle blocks and assorted other devices also, none work as well as Herbie's.

Yes, all of the above Plus dead balls (Norsorex). I, too, just ordered a set of the Waipuna myrtle block thingies. It never ends. But I hate Vibrapods, which destroyed the top finish of a couple of my components. NEVER use these things without something solid between them and the component.

I use very thick MDF shelves (several layers) and maple facing. Enclosing stuff in cabinets really helps a lot compared to leaving things out in the open...much of the higher frequency vibrations are airborne. Leaving things out or on the floor is about the worst thing you can do.

MDF has a huge advantage in that it is cheap - so you can use lots and lots of it. In vibration absorption thickness helps. Good Luck.

I have gone through the whole range of cones, bearings, replacement shelves, freestanding platforms, and replacement feet from a wide variety of well known makers. Got sick of the constant changes in coloration through the whole lot of them, and finally bought Grand Prix Monaco equipment and amp stands. Low noise, no evident coloration that I can detect, and very clean sound. Expensive and worthwhile.