I just installed them and 3 out of 4 started blinking at end of life. But that's not the end of the bad things - the tamper protection makes it incredibly difficult to connect ordinary devices or other electrical devices. You'll end up fiddling with the fork for 5 minutes before it finally seats properly. If your time is valuable to you at all, do yourself a favor and spend a few bucks more on a better quality GFCI socket.
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