For what it's worth, I use the Maestro outlets with a dedicated line. The sound is extraordinarily quiet and dynamic. The outlets could be a little grippier. Used cables make the most sense for me and I've never had a problem with any of them.
Power Cables and Wall Sockets
Without knowing for certain, it seems to me that power cables can only be as good as the in-home wiring coming to the wall socket. Is it possible that those who use expensive cables have improved the wiring to the socket? Or is the power from most wall sockets normally excellent, but is limited by conventional power cables?