This travel mug is, in a word, awesome! 
I brew a pot of coffee every day. That’s enough for two cups with my breakfast. Depending on daily activity, the coffee that’s left in the pot will cool down to as low as 89 degrees. So, I’ll fill the Ember Travel Mug and set the temp. to 143 degrees, and in about 10 minutes, the coffee will taste as fresh as it was brewed that morning! (I’ve tried the microwave, folks-it ain’t the same, sorry!) No more dumping out cold, expensive coffee! 
And, I recently slipped on an ice patch at work and fell backwards, let go of the travel mug and watched it hit and bounce off of the asphalt. Surprisingly, it did not give up a drop of its contents! And, it’s working just fine, keeping the temperature as steady as before!  
To say that I am completely satisfied with this product would be an understatement....I can’t recommend this product enough.