The device seems to be working great so far. Though the wifi setup is a bit confusing. The device has to be in standby, essentially powered off while still plugged in, then touch and hold your finger on the wifi "button/area" for 5 seconds.
I'm a smoker and I placed the device close to where I sit and it registers when I light up and the fans kick up ,presumbly cleaning the air.
I put it in sleep mode at night and I noticed that the device registers in the 400 to 500 range for about 10 minutes and then quiets down.
I'll try and comment about my expierence in a month or two.