Power Conditioners

Gee, I'm starting to feel like a poster of posts lately, but I am finding a lot interesting, sometimes controversial, comments from the "YouTubers" these days, much more so than in the past.

There are a multitude of threads on this subject here on AG of the what's, why's, how's and when's of PC's but not many on the thoughts of having none.

I wondered what your hands-on experiences were with power conditioners and if they added something to your musical enjoyment or as in this fellows case, taken away from it?

  https://youtu.be/XjzlFkcZP1g