I was curious if anybody here uses power conditioners...if yes which one (make/model/cost) and how much of a difference do you hear with them?

I mean, is this comparable to people claiming to hear a big difference with exotic cables or is there more scientific substance behind it? Are there certain areas of the country, or certain types of housing/neighborhoods which have a greater need for a p-c?

Quinn mentioned hearing a difference using a cheap eBay one with his digital JVC receiver; I just have an analog Marantz (5400).