I have owned one of each of the Ember mugs. This tumbler has greater capacity which fits a grande latte and most medium drinks perfectly. The screw lid has proven to be leakproof and the lid stays secure which is perfect for high movement activities. Battery life is long enough to get through your drink. It doesn’t leave your coffee with a burnt taste over time.  CONS: This tumbler does not fit in vehicle cup holders. It is not compatible with Ember’s new portable chargers for vehicles. It is very wide with no handle and is awkward for smaller hands to hold.