I've had this thermostat since we had our new central A/C system installed in early June. I've been very happy with the operation, control and WiFi capability during that time. On a recent week-long vacation I tried the "Vacation Mode" feature for the first time. Setting it up was easy and straight-forward. However, I found out that the Android App would not let me get into or change Vacation Mode settings remotely...all Vacation Mode schedule edits need to be done AT the thermostat. Not sure why this is but I feel it's an inconvenience and defeats one of the purposes of having a WiFi feature...it would be nice to be able to have control of the temperature if a vacation period is inadvertantly shortened for example.
I needed some minor help in programming the thermostat but after that, it's been working flawlessly. Only wish is that the app had more control over the thermostat features over wifi. For example, I set up vacation mode for being away from the home only to find out that I can't cancel or adjust vacation mode using the app when outside the home, thus only 4 stars.