I tried a few different outlets in my old PS Audio P600 and then tried them in the wall as well. My P600 came with the orange hospital grade outlets. Originally, I bought an Oyaide SWO-GX and an R1. The gold plated GX was marginally better than the stock outlet but too warm and syrupy for my taste. The R1, however, was a huge improvement over the stock outlet and the GX offering much more detail top to bottom with greater air/extension above, much better dimensionality, and both a more authoritative bass range and greater dynamics and control. I thought the R1 would be my final outlet choice but I tried both the Porter Ports and the Cruze Audio Maestro and these revealed to me the single shortcoming of the R1, that is a slight loss of transparency. Either of these outlets made the R1 sound a bit veiled. I can see how this might not even be noticed in many systems but it's there, if you listen for it. I sold both Oyaide outlets and bought another Porter and Cruze Maestro outlets. I think the Porter might be ever-so-slightly more transparent but the Maestro has the control of the R1 while the Porter seems to lack a bit of control, at least compared to the R1 and the Maestro. The Furutechs may be better but I've never been tempted to experiment further with outlets as the Porters and Cruze's sound excellent in my system and switching around outlets is a PITA.
And don't listen to the naysayers here. An opinion doesn't mean much without direct experience.