Has become a necessity for warming breast milk bottles! My newborn can’t take cold bottles and heating them with a bowl of hot water was taking too long and just not cutting it when we had a screaming hungry baby.This warmer is super easy to use and warms bottle within minutes! Not sure why there are so many negative reviews as it seems very straight forward. Perhaps it user error on their part. The dial reads the number of ounces you are warming (not minutes), you place the bottle, fill with water to line up to the milk line (being a little over or under doesn’t make too much of a difference), and press the power button. There is no beep to tell you it is done, which I think a lot of people don’t like about the warmer, but I find that I tend to watch the thing as it’s going so it doesn’t make much of a difference. It also stays on and keeps the bottle warm for up to an hour if need be.I love this product! It makes life so much easier for my husband and I during late night feedings. I look forward to testing it with defrosting breast milk and food eventually.