Like a lot of things in high-end audio it depends on your system. If your cables are not shielded very well they will make a bigger difference. I had some Mapleshade speaker cables they made a big difference on, for example. My current set-up is very well shielded but during the winter, when static electricity sometimes builds up in my carpet, the elevators take away a layer of haze in the treble that is there when just laid on the floor. I also think it depends on how long your speaker cables are. Longer runs will need elevators more than small runs - after all speaker cables are nothing more than copper/silver wire wrapped in sometype of protector i.e. big antennas. So, I don't think cable elevators are hocus pocus but they may not be for everybody or be needed in every system.
