Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Doesn't work as advertised

Ehh, I bought this product to avoid my MIL using the microwave to heat bottles. The thing is that it really depends on the amount of milk and size of bottle. The warmer starts right away and creates a lot of steam. What i found is that a cold bottle from fridge would heat up a lot on the outside but a couple shakes and it would still be cold. I didnt find it evenly heated it through.Its still best to just sit it in hot water for a couple mins. :)But we will use this to keep cool bottles in the freezer pack in the back (remember to freeze the ice pack)-Overall, save your money and use the traditional method.