Instruct: Classify Amazon reviews into positive or negative sentiment
Query: WAY TOO LONG TO WARM UP!

I tell you the truth. I was so happy that this existed. But quickly became disappointed. It took so long and it never really made a diference. I find it easier to just sit it on my lap or snug between my thighs and warm up the bottle with my own body heat while I drive or sit in the car. It turned out to be more useful that way. When my baby was on powdered formula, I would heat up the water before leaving the house and carry it in a thermal pack. That worked too. Great idea, but needs lots of improvements. I am glad it works for other parents. It just didn't do the job for me.