I love drinking from this awesome glass! There are a few caveats to mention, however,. 1. The sipping hole cannot be closed, so it is not spill-proof. 2. As mentioned by others, it is no match in insulation to metal cups, but better than no insulation. Also keep in mind that it IS glass, and can break. 3. My biggest problem — especially when drinking something with milk in it, but even black coffee or tea — is that it can be difficult to clean because it is a narrow glass. Even my usual dish brush or mug scrubber will not reach down to bottom. However, I’m hoping that the LWP Bottle and Dish Brush does the trick! Otherwise, it is a wonderful glass for coffee or tea!