Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great, but not dishwasher safe

This was great, until we put it in the dishwasher. It says top shelf dishwasher safe, but after running it through the the temperature sticker started coming off and the top 'cap' no longer held in place. One of the benefits of this over a bowl is that the lid keeps the bottle being warmed from floating out of the water. This helps the bottle warm faster since all of the milk is submerged. We tried contacting Firt Years to get the top replaced and were told they were not able to and to return it to the store. Surprised at the hassle and the warmer now serves limited purpose.