At my old house I did a ton of research and ended up buying an EcoBee 2 although I originally was thinking Nest. Compared to my friends with Nest, I think EcoBee is much more functional and matches my needs better. I just moved and right away I bought 2 of the EcoBee 3 Lite (new house is 2 stories so I needed 2).First off, install is easy and they include everything you need with easy to follow instructions. They include a power booster attachment if you don't have a C wire but for all 3 of these I've installed, I found my wire bundle had an unused wire so I just hooked up the C-wire and used that. It was really quick and easy and took maybe 10 minutes for the whole install.The thing that really pushed me towards EcoBee were the sensors. I've bought 4 room sensors and have them all over the house. Our thermostats area usually in a hallway but I care way more about the bedrooms we're sleeping in, living areas we're hanging out in, etc. Being able to average those in really improves the comfort level of the house. Using the "follow" function has been really useful allowing us to only average in occupied rooms to not over cool/heat for rooms that don't matter.The app is easy to use and I have it hooked to Google Home as well. There are tons of settings I can nerd out on, tweak for my house, etc but also you can leave it with factory settings. Also, the HomeIQ is interesting to look at and try to improve our house's performance.I've used these on a 2 stage A/C unit as well as a 2 unit house and it handled those nuances with ease and really simplified setting them up for me. I also got a rebate for installing these from both my Gas and Electricity company so I got $150 back making them cheaper than a standard thermostat. I'm also able to enroll in my electricity company's Smart Energy program which gives me credit on my bill for letting them adjust my thermostat in high use times. From that alone I've gotten over $50 credit on bills so I'm already in the black with these purchases before I even look at energy saved for being able to program them better, set vacation times, adjust the tmp from my phone while not at home, etc.Overall, I love the smart thermostat and can never go back. I'm making money on them and the house is much more comfortable and efficient. You can go crazy with settings and nerd out or do a basic install and still see huge benefits. I much prefer the EcoBee over competition such as Nest and recommend it to anyone!