Bests & Worsts Reviews from Amazon

I bought it for my forgetful mom who sometimes leave pot on gas range oven unattended. It seemed to work fine. I liked the feature that lets you know the alarm is about to go off. It always triggered when we seared steaks. We had to open windows and let the smoke out to prevent actual alarms, but it's nicer than hearing alarm. Also, it meant that it was working well at detecting smoke, I guessed. Well, that was a false sense of security. Today, I came home to find out that my mom left something on oven again. My house was full of smoke almost to the point that it irritates my eyes. After opening all windows, doors, garages to dissipate the smoke, I was wondering why Nest didn't alert me by phone. I checked Nest app, nothing showed up. I ran Nest Protect self-test. It completed fine. House is still in deep smoke and Nest can't detect the actual smoke! How am I going to trust a device that couldn't detect a house full of smoke? FYI, when it detected a smoke (during cooking steak), it probably detected burnt oil? This time it looked like my mom tried to boil something. After boiling water away, gas oven burnt pot and vegetables inside without oil. I'm wondering if it only detects burned oil. Anyway, I can't return this, and I can't trust this device anymore. Goo $100 wasted. =========== I've added the screenshot of this Monday stat. That refresh icon means I commanded Nest self-test and it completed successfully, during house was full of smoke. I'll upload actual time lapse Nest cam video of the blackening pot after I crop it to remove rest of my house later. =========== 7/6/2017 As Jarrard suggested, I contacted Nest Protect and they asked me to do some test and record video of it. So, I'm going to record video of burning pot of vegetables tomorrow. I'll update this post with video if it still fails to detect the smoke again.