There has been some very good and interesting comments on this subject and I thank you.
I think the Niagara 7000 is a different animal than many power conditioners because of the huge transformers inside. When you place your ear close to it you can actually hear it hum.
I went ahead and ordered a set (4) of the Critical Mass 1.0 footers for the conditioner. The funny thing about these footers, they go through a weird break in stage. I know, hard to believe, footers breaking in. But, with my other equipment they first sounded just ok, then bad, horrible, and then about 10 days later glorious!
So, if they do improve sound quality underneath the Niagara, I wonder if these too will go through the same break in phenomenon.
ozzy