Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very good bottle warmer

I don't use a whole bunch of bottles since I nurse, but occasionally I thaw out some breast milk for when my daughter and I are going to be out in very public places for a long period of time. This works great. I just put the milk in the warmer and in about four minutes it is done. Sometimes however, when I have a 7 ounce pack it takes a few times through it to get it all the way warmed. Since I am using this for when I am out it isn't a big deal that it takes awhile, especially because you have to wait for the warmer to cool all the way down before you can use it again. However, when I use it to heat milk from the frig so my husband can feed her, it works great. I wouldn't suggest walking away from it because sometimes it gets too hot when the whole four minutes is given to heat. Walking away while heating a bottle is not wise anyway, so it really isn't a problem standing there for it and it is a whole lot quicker than boiling water.