I had one fail upon energizing after installation. It worked just fine at first few testings with my yellow Ideal gfi tester, but I tripped it using the built in trip button and it started smoking right there and then. However I was in a high rise where the breakers were locked up in a common closet, and I had already dismissed the security guard with the key a few minutes earlier. Yep, the breaker didn't trip (FPE naturally), and I had a tense few minutes while frantically unscrewing a live arking 20 amp device out of a metal flush box in a high rise packed full of occupants. And a general contractor nearby who's eyes went from normal to saucer size during all this. That brand was in a discount display at the counter of the wholesale house . Instead of the usual brand I cheapo'd out and tried to save myself about 4 bucks, and nearly had a major incident. This is a big player brand, made in USA. Never again..