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Pro Amazing design
The Nest thermostat looks like a piece of tech from the future. It's fully circular and certainly looks the part of a smart thermostat.
The display takes up the majority of the unit, and makes good use of its LCD display when not in use. It can display an analog or digital clock instead of the temperature if you prefer.
Pro Learns your preferences and adjusts accordingly
Nest begins learning as soon as you install it. In a short time, it will automatically be adjusting your temperature based on time of day, or how active the house is. For the first few weeks you may need to adjust the Nest a few degrees when required, but eventually it will learn when you adjust it and will start adjusting itself automatically based on how you manually adjusted it before.
Pro Integrates with many other products: Nest, Alexa, and IFTTT
Nest also makes other products, such as it's Nest Cam, and smart smoke detector.
Alexa is the voice assistant in the Amazon Echo line of products, and the Nest thermostat can be fully controlled by Alexa. This is important because Alexa can control devices through 100% hands-free voice support.
IFTTT (IF This Then That) is an ecosystem to itself that allows users to create their own custom recipes based on triggers. For example, if it's expected to be humid, the Nest can automatically lower its setpoint to compensate for it. You can also configure other triggers such as location or time of day to determine when the Nest is on or off.
Pro Motion activation available for alternative mode of controll
This version of the Nest includes motion sensors that can detect motion from across the room. Previous generations of Nest could only detect motion up to a meter away, but with this generation of Nest the utility is greatly increased.
Motion sensing is useful, because it will sense when you are at home or if you are away automatically, without needing to adjust the thermostat manually.
Pro Shows energy savings
The Nest app will actually show you how much your smart thermostat is saving you on electricity.
Pro Easy installation
The Nest Thermostat is the easiest smart thermostat to install. It comes with the required mini screwdriver, and there's a level built-in to make sure the Nest is installed properly. The included baseplate helps cover up any imperfections left from removing your previous thermostat.
Installation is straightforward, and only takes about 10 minutes.
Pro Complete control from app
Even if you're not home, or you're in the kitchen cooking, and need to change the temperature, you can do it all from your app.
Con Doesn't provide room-by-room sensing
The Nest Thermostat doesn't have any other hardware that integrates into it. That means that it only senses temperature from a single point, which means that there can be cool/hot spots in other rooms where the temperature isn't being taken.
Con Hardware control is through a rotating ring
On the Nest itself, the homeowner rotates the ring on the edge of the Nest as the primary way to interact with it. Most controls will need to be done through the app.
Con Long wait times for support
If you run into issues, calling tech support can sometimes lead to long wait times.