michelzay,
I have the SR outlets. And... Oyaide R1, MIT, Maestro, PS and the Furutech GTX-R and a few other outlets.
To my ears, and with my system, I prefer the Furutech GTX-R. It has a better all around frequency. I also prefer not only the Oyaide wall covers for sound quality but I think they look better too. I have a total of 4 Oyaide Duplex covers and 8 Furutech outlets.
The other outlets are used in my homemade DIY outlet boxes that can be seen on my system page.