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The Nest thermostat is still arguably the flagship thermostat in the market. Ecobee and Honeywell offer competitive thermostats at similar price points, each with their own distinguishing features. Nest has the largest ecosystem of the three, though, and unless you’re an Apple Homekit house (and honestly, who is?) Nest will work with anything that its competitors work with and more.
If you’ve been in the market for a Nest thermostat, this is probably the best price we will see until the holidays.
(Note: Amazon is now offering the 3rd generation Nest for $199 with no indication of when the sale will end)