The device itself is fine but the app updates are slow. Takes 20 seconds to get updated information. The widget is even worse. Only updates when it wants to. Will be returning the product to see if the wifi version gives more timely information.
I put it on the room and it works well. Only downside is that you need to be nearby the device to get live update, otherwise it will stall and you can only see the most recent stats where you were connected with Bluetooth to the device.
It works well to record temperature and humidity in our greenhouse. My phone downloads the data when it is in range of the bluetooth.
Works perfectly, No issues so far! I will recommend it.