ecobee ecobee3 Programmable Touch-Screen Wi-Fi Thermostat: Maintain a comfortable home with this programmable thermostat, which is Apple® HomeKit-enabled, so you can control the temperature remotely using your compatible device. Home IQ helps you conserve energy.
I LOVE my ecobee3- I was able to save about $40 off my electric bill in the first month of use!
The remote sensors are one of the most unique features and really make this a worthwhile investment by reading not only the temperature of each room, but also determining whether or not a room is occupied and adjusting the temperature accordingly.
I also love the smartHome/Away feature that automatically switches to "away" mode during programmed home times if no motion is detected after a given amount of time (or "home" mode if motion is detected during an away time).
Vacation mode has come in handy a few times, as well. You can program in your vacations- or, use IFTT to automatically add them- and the ecobee3 will suspend your normal schedule until you return. (Of course, you'll want to resume your schedule a couple of hours before you return so your home will be nice and comfortable when you arrive...)
Installation was very easy in my case and only took about 20 minutes. I did have to call technical support because I apparently had a non-standard wiring setup, but they answered quickly and were able to resolve my issue within a minute or two. They were very helpful and as only a semi-handy person I wouldn't hesitate to attempt installing this on my own again.
The only con I could come up with if I had to is that the app (including widgets and Watch app) is sometimes buggy- but not to the point of being unusable. It has been recently updated and improved, but before this point it could be a bit slow. If that is the worst I can say about it, then I'm okay with that!
Overall, I would totally recommend this thermostat to anyone looking to jump into the "Smart Home" game and wanting to save a few bucks!