I'd like to jump in as i'm pretty happy with my setup right now:
1> Hometheater room: There are 8 duplexes in the room. So i pick the outlet that is next to my system as outlet 1 (O1)
O1 -> PE and Power conditioner
O2 -> PE IV
O3 -> PE
Hammond choke 193L at power conditioner IEC
I mainly do this for video: picture is awesome. Also, sound is cleaner compared to before installing PE series. (I don't have high end stuffs in my hometheater so i can't compare with others)
2> 2-Channel room:
O1 -> PE V custom/pro -> PS audio UPC-200 [I intend to get rid of PS audio , but i keep it as a surge/spike protector]
O5 -> Reference One Filter.
The sound before adding Reference One filter was excellent: i can hear every details from my favourite CDs. After adding Reference One filter, the sound is kind of overly warm, but it is now so smooth from top to the bottom. I especially like the bass( which is the weakness in my system): punchy and deep.
I'm sure that my systems can be improved a few notches more, but i like what i hear right now and i don't dare to change them

Hope this helps based on my own experience.