I just got 2 of these from Amazon to replace my cheap $.59 power receptacles in my living room. One is about 3 feet away from my electric panel, that's what my SurgeX conditioner/supressor is plugged into, and my system is plugged into the SurgeX.
The Leviton receptacles I used are MRI grade, after researching power receptacles I found you want 1. Hospital grade for increase pressure on the contacts. 2. No steel or nickle plating. The MRI receptacles provide all this in a relatively cheap ($18) product, MRI rooms must not have any magnetic items in them, so the receptacle's conductors are all brass with no steel or nickle plating anywhere, and it requires a lot more effort to insert or remove a male plug.
The result is a noticeable improvement, dynamics are slightly improved as is the clarity. Years ago I built PCs using 12g mil spec wire, I used hospital grade male plugs but the neutrals are nickle plated, so the next step is to order 4 male plugs, probably the Wattgate 5266i.