The Cooper TR duplex receptacles that I used for one new house were pretty smooth operating, as well as the Leviton TR duplex, but the Leviton TR GFCI receptacles had that noticeable restriction the first time I used them. The P&S decorator TR receptacles I used for one kitchen remodel were also not so hot. They were made in China and had that same noticeable restriction when the plug-in tester was initially installed for the first time. After a good push and some wiggling, followed by a slight plastic pop or tick sound coming from within the receptacle, the tester could then be inserted and removed without any restriction. The other bad thing about these P&S receptacles was that the metal yokes were made very thin and would flex so much that even when properly installed, the thermoset wall plates could still sometimes crack when you did your initial plug-in testing at finish. I used to really like P&S, but won't be using those again.
