What is Reddit's opinion of Diamond Group WDR15BR Brown 15 Amp Decor Speed Box Receptacle?

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Thanks everyone for the suggestions. I pulled out one of the plugs, and it's one of those self-contained types, which does not use any screws to hold wires. Instead they are in these very tight metal crimp type connections. It's basically this plug:

https://www.amazon.com/Diamond-Group-WDR15BR-Brown-Receptacle/dp/B004M8HPM2/ref=pd_cp_469_1?_encoding=UTF8&pd_rd_i=B004M8HPM2&pd_rd_r=SC9A3HFGXXCPKB669R10&pd_rd_w=MNRZz&pd_rd_wg=waeg5&psc=1&refRID=SC9A3HFGXXCPKB669R10

I didn't notice any melting in either outlet. Do these types of outlets go bad, even if visually they look fine? Or does a bad outlet usually show some sign of melting/burning? Does anyone have suggestions for removing the wires on these types of outlets? They are pretty secure. I'm thinking I can unplug each outlet and try turning on breaker to see if it's a particular outlet.