I have many Ninja products in our home. Cookware, slow cookers, etc. I know the quality of their stuff is very good, and I trust them. When my wife needed a new travel mug, I decided to give this a try. It exceeded my expectations. Keeps coffee hot, or drinks cold, for a long time. After three hours, she checked her coffee and it was still just about as hot as when she put it in. It even kept soda cold, and fizzy, for just as long. If you like carbonated beverages, this is for you!