Reply to Jadem6. In my experience, I haven't noticed a loss of impact or pace on the notes. Another listener might find otherwise. I have read some general discussions of using isolation feet and they have raised some questions similar to those you have raised but no one, as far as I have seen, has made a strong statement against the use of this type of isoation system. My thought was that for $85.00 they were worth a try. I wasn't willing to commit to spending the high price of some of the other brands without hearing for myself whether they really made a noticeable sonic improvement or whether they diminished the sound in any way.
Reply to Nrchy. I have read about the Aurious isolation feet but I haven't personally tried them or heard a system with them in use. I do know that structurally, they are very similar to the Darumas. They have the same basic two-piece construction with a ball bearing between. In doing my research into using isolation feet, I did run across one comparison between the two, which said that the quality of the machine work of the Aurious is slightly better than that of the Darumas but that sonically, there wasn't really a big difference. I don't remember where I read this. It was on the web, though.