Not particularly. I feel its more important to match the right cables to A. the overall system and B. the customers tastes. It's also ok to mix and match, although, the full loom theory may address some of the OCD we all have.
I can say unequivocally, the Shunyata NR power cords reduce noise. There is just no doubt. I've heard it time and time again (with the sensitive horns). While the AudioQuest Storm Series power cords offer a level of transparency that is instantly recognizable. Power cords are the items where customers really hear a big difference. I guess one could argue that the more current a cable carries, the easier it is to hear the differences: power, then speaker, then IC.
When it comes to power conditioners, it's more of a small improvement or difference between makes and models at the same or similar price point and when someone is comparing a Denali 6000T to a AQ Niagra 5000 (or visa-versa), they may feel the differences or improvements are more subtle and not worth making a switch. This, in audio, is the hardest thing for people to wrap their head around. The 1%, 2% improvements are much harder to accept and invest in, despite the fact that we all know they add up over time.
I'm still trying to wrap my head around power regeneration. I would love to hear from Caelin on his thoughts. I know power regeneration is theoretically best for digital sources, but the units seem more fickle and prone to problems.