I've had the ember products for a number of years, loving the mug (both 10 and 14oz), and the travel mugs.

The travel mus have a big problem: they break easily.  I have had to replace the lids multiple times, with problems of the center not opening to breaking the center of the lid coming out completely. 

I will continue using the mugs, but will not use the travel mug, not until Ember fixes the bad design of the lid.