PS Audio Power Port vs. Hubbell/Leviton

Has anyone compared the PS Audio Power Port outlet to the upgraded outlets available at Home Depot from Leviton, etc.? I looked yesterday, and the Depot had commercial and industrial (although not hospital grade) outlets, and although the outlets looked a little more durable, the electrical contacts didn't appear much different than standard. Obviously, the Power Port is a lot more $$$, but I'm wondering if it isn't understandable for nickel plating on the contacts.

Also I've seen some references on these threads to cryo treatment...could someone elaborate?