I like that it keeps my drink hot for a long time better than any mug l have used also it feels good that even if the mug falls it won’t leak. But I didn’t like the bad smell in the mug after the coffee even when I wash it. I had to leave it open after wash to breathe and control the bad smell. The upper side is stable u can’t clean the small parts and maybe this is the cause of the smell. For all it is an excellent good material product.