Generally, I really like the mug! I was happy to see it could be microwaved, but later when I poured hot water into it I heard the distinct sound of cracking. I looked all over the mug and couldn't find anything wrong with it, so I think it's safe. The design also had some bubbles and chips I wasn't too happy so see, but I don't think I would have seen them if not looking for cracks. Still love my mug!