Ideally what you want is a floating effect isolating the component. In addition, if you can also get some vibration transfer out of the boxes (everything except turntables) that is ideal. Floating doesn't work for me with my thin floor standing speakers, so I went with a multilayer platform that does an excellent job transferring vibration with some isolation, but not as much as podiums or roller blocks.
The only product I've seen that does both are the Symposium roller blocks. They are a little more expensive that Townshend podiums, however for most weight applications, you only need 3 of them (3 points determine a plane for those who forgot geometry) and they become a little less expensive.
Under my turntable where I don't need vibration transfer, the podiums work great, and I have them screwed into a seismic platform (sitting on top of a wall mounted shelf screwed into the wood studs). That makes it much easier to level and you don't have to worry about optimal podium placement. This platform however is solid powder coated steel without sublayers, so there is no vibration transfer which is ok since there is vibrating box. Power supply is separate. It adds a couple hundred to the price, but it is worth it to me.
