The mug is great. The app is such junk that it’s infuriating. – Ember - Temperature Matters Review

From the app thinking your Bluetooth is off when it’s not, to not recognizing your password, to not letting you change your password, to the amount of times it says “Oops, an error has occurred” — by the time you finally get the darned thing working, it would have run out of charge and your coffee would be cold anyway. I’ve had it three months and I only get more annoyed with it. This was a birthday gift to me; I’m glad I didn’t spend my own money on it!
Review by moongirl on Ember - Temperature Matters.