I think 2 other issues to consider are how dirty your current power is, and what quality of gear (amp and such) you currently use.
I don't have high end gear (NAD t753 surround, and NAD c372). In my main system (NAD t753), I have two conditioners in use in the one system. One is Richard Gray 400, the other PS Audio Quintet. I have removed both from the system, and only one at a time as well, and always run back to having them back in my system. Installed the PS Audio Duet with my NAD C372, and it sounds much nicer now too.
Yes, they do "color" the sound, but so does any change to interconnect, amp, speaker, etc. All add their own "color" or signature sound. The question is, do you like the change? I'll read the specs and the theory, but I know what my ears like. I'm not a purist. I'll try any reasonable change, as long as I have the option to return the equipment to the dealer. I am lucky that a local dealer allows that. Just test drove 3 sets of speaker cables over the last 3 weeks, and then picked one. This with no cost up front.