Spending hundreds of dollars on a commoditized product one can buy for $2 at HD is a ridiculous concept but I did it anyway. I bot the AQ Edison receptacle expecting some improvement but that wasn't the case. I didn't spend too much time testing it. For $200, I'll assume it works and does its intended job.
Anyway, where it was undeniably beneficial was in the high-tension grip. It's quite impressive. I have a heavy AQ Hurricane cord plugged directly into the wall. The cord rests on the floor but tugs down and away from the wall. Still the cord's plug itself is really secure. The receptacle also has some nice weight and a lot of shiny metal contacts. It feels premium.
BTW, the ground pin is up in my installation. I'm not sure whether that matters. I read that hospitals use this orientation for obvious reasons.
I tried some generic hospital grade receptacle before the Edison but found the grip was insufficient to support the cord. If you want grip, the AQ is it. You can be the judge whether sound is improved.