I have tried quite a few outlets in my system(s) from all the Oyaide outlets including the R1, PS Audio PP down to the Arrow Hart's and have to say that the Oyaide WPC-Z wallplate mounting system is an essential part in dropping the noise floor and allowing the outlets to really be heard for what they offer.
With system dependance being a huge factor in the outcome of how each outlet could be characterized, the Oyaide R1/WPC-Z has smoked all other outlets in sheer musicality. The PS Audio PP have a much tighter bass but their foward mids and prominent grainy highs held it back. The Arrow Harts do not even begin to compete. They are however, better than the .79 cent outlets that usually come stock in homes.
I have not tried a Porter Port and from the comments posted here, I just might to see how it stacks up against the R1. As to the SR Teslaplex, I don't share the enthusiasm that others do as I was able to hear it head to head in a setup that allowed almost instant outlet changeout in a high resolution system and compared to the R1, it lacked the sheer musicality of the R1 and it also cast what could be descibed as a "haze" over the music. The soundstage also shrank by a small degree with the Telsplex which I found quite odd. Of course, others who have installed the Teslaplex in their systems are more than happy with the results so again, system dependancy is highly at play here and it may not have been fully broken it at that time. I plan to revisit the Teslaplex in my own system here in the future and will report out what I find.
Cheers