My old apartment was ½ done with those Masque things... The maintenance crews were in the process of changing the prehistoric Slater backwires out to Decora's when the Home Depot a block from there imported what I can honestly say, isn't the greatest idea... I looked behind some of them & found the original recept with the prong holes nice & gray from overheating... But hey, they "look" good... (Till they melt) I'm kinda suprised to find a UL listing on those as well, since they do inhibit full insertion into a wall recept...
