So I have been turning my home slowly into a smart home over the past 3 years with smart switches, bulbs, plugs, locks and a Wink Hub 2 to help them all work together. I have avoided thermostat's because I was concerned about others in my house not knowing how to use them.I bought a Nest thermostat about a year ago and it just didn't operate the system I bought it for correctly, ever. I was always adjusting it up or down constantly; not really what you want to do if you are looking to save energy.So I looked at Ecobee. I have heard the problems with the Ecobee 3 working with Alexa or being sub-par in its Alexa integration so I held off. Then they came out with this "Smart Thermostat" with full Alexa integration, better speaker, etc., so I decided to try it.My house is large, I have 4010 square feet, 2 furnace/ac setups and 3 zones. I tried the Ecobee Smart Thermostat on the largest, single zone section of the house for a week. To say installation was a breeze is unacceptable; it was done within 30 minutes, including removing the old stat and installing the new one (10 mins), I had it configured to work with my newly installed app in another 10 minutes. Schedule was done in the last 10 minutes.Its very intuitive to use, simple on the main screen where anyone can simply look and see what it is set to, what the current room temp is and current humidity reading; that's it. If you want to change the temp its a simple slide bar on the right side of screen.While it is simple enough for anyone to change it has many features in the menu and app to let you drill into setting up the optimal schedule, limiting ranges that people can change the temp, as well as reviewing trends in your usage. Just an overall excellent product, well made and very thoughtful interface.I like it so much I bought 2 more for the other 2 zones which sit on the same furnace/ac unit and has a zone board with 2 electrically operated baffles, making these a bit more difficult to install. Also, one of these did not have a G or C-wire.I decided for these 2 additional stats I would go with the Ecobee 3 lite Pro since I wasn't worried about talking to it directly (yet they both still function through Alexa, allowing you to change their temps or get info from them through Alexa using one of my other Alexa devices in the house).I had to work with the Ecobee support team to figure out how to set these up correctly. The only thing I had to do special is make sure I wired up the G and C wires in the zone board at the appropriate terminals and then connect them to the stat as normal. This was made easier since the wires were actually there just not being used in the old stat or the zone board for some unknown reason.All in all, my house is now fully smart when it comes to the thermostats now and I am already noticing the temperatures are more consistent with the stat readings. I fully expect to start saving money with these things quickly. I am glad I went with Ecobee instead of Nest, including with all the recent talk about Nest moving away from Google Assistant (which I also have in the house).Hope this helps.