Given to me as a Christmas present (everyone got one) and we all love it. 
3 things:
1.  Hate that the coffee spurts up all over your hand when you have to push hard on top because it’s so suctioned closed. Which I know is a GOOD thing. 
2.  Wish had a USB or car charger. ITS A TRAVEL MUG. 
3.  Wish it had maybe a piece that sits around the charger that would hold THE TRAVEL MUG in place so when driving I don’t have to constantly grab it or it falls over and spills if not closed or goes into the passenger seat or floor if I stop quick or turn to fast. just suggestions of some new products.