I’ve had my ember close to 2 years now.  I would not say I am a coffee fanatic but I do enjoy my coffee and I use this mug 5 days a week.  It is a luxury item no doubt.  I has worked great for me and I love not having to rush and drink my coffee in that short window when it cools down but before it gets to cold.  The battery lasts plenty long for my commute and then some.  I have a charging coaster in my office so my coffee it still hot even if I get busy and forget about it.  Ember’s technical and customer support has been fantastic the couple of times I’ve emailed them.  I wouldn’t hesitate to purchase again if I lost or broke this one.