Proably more upset about the Remote Sensors than anything. I actually love the EcoBee and stayed playing with it when I first got them but like they say, Hindsight is 20/20
In regards to the analysis, I think that it is a little unfair because there are plenty of community apps that can make a regular “Dumb” Therm very very very Smart. Especially using CoRE.
Cons:
No scheduling capabilities when connected to a Home Automation hub.
Limited features (not able to control other devices such as humidifier/dehumidifier/HRV/ERV)
Not as responsive (especially for battery-powered thermostats)
Depends on who you ask. I turn on/off my therm with EcoBee3 and it still takes 5 minutes to turn off and 2-3 minutes to turn on. But hey, what 5 minutes amongst friends? I can tell you that 30 minutes to update motion is not that responsive at all.
But again, The EcoBee will have paid for itself within a couple of years and it is a great Therm!