all the time and have never had any problems. I have noticed that over a period of time (3-5 years) that some of the picture will start to fade - depends on the usage. For my PO Riverside mug, I ONLY use it for my Disney trips - therefore, it gets a good washing once I get home (dishwasher) and then is stored away with my Disney-only backback until the next trip. My other Disney mugs (the ones you can get in the parks) I use at home all the time and they are the ones that are starting to fade.