The Ember Mug 3 is brimming with potential, but it leaves a bitter taste

What happened
A self-heating mug is a great idea, but for $150, Ember's third-generation flagship is a tough sell.
Summary assembled by rule from the sources below

A self-heating mug is a great idea, but for $150, Ember's third-generation flagship is a tough sell.
Summary assembled by rule from the sources below