Nice smart thermostat with a nicely designed display. Prospective buyers, however, should be aware that, if your setup doesn't have a “C wire” (this wire supplies power to the thermostat), you'll need to purchase at least the Enhanced or Premium version. These versions include a small power adapter that has to be installed at the control panel of the furnace. The basic version does not include this adapter, and has to be purchased separately. I think it's around 30 bucks. Instructions for installation of this adapter are included, and they are clear and easy to understand. If your system has the C wire, then installation of the Ecobee is much simpler. If your system does not have the C wire, I would strongly suggest looking at the Ecobee website's info on the power adapter installation before purchasing.