Joe:
Is this another test of the old adage "you get what you pay for"?
We/I use "spec" grade devices. I know there is no industry standard of "grades" but the "pricier" devices do not cause any problems "down the road". We also install "Decora" type devices when the decorator/architect specs them, but I make sure the supply house has "real" ones. There was a rash of off-shore crap floating around for a while; (China, mostly). One supply house had a bunch of it, we got some delivered, and they came back awful quick to pick it back up. The GFI's lasted 2-3 days.
I feel the "cheap" stuff primarily is available at the "Big Boxes", and some resi EC's shop there for the bargains. We/I primarily do comm work.
The above is my humble opinion, and is not to be construed as derogitory to any country, mfg, EC (Sparkies) or "Big Box".
John
