Instruct: Classify Amazon reviews into positive or negative sentiment
Query: this thing is not worth the trouble

I bought this for the times I went places were it would be hard to have my daughter's bottle warmed like the mall, the zoo, etc. However, I have found like most of the other reviewers that it takes a long time to warm up and it activates on its own. For example just this morning it activated twice on its own and I didn't touch the disk, once was after I boiled it I was going to put it away and the second time was when I was trying to put it into the blue cover and it activated again. And the other down side is that you do have to boil it to reuse it so if you are going to be out for a long time where you might need to feed your child more than once you are still looking for a way to get the bottle warmed up. I wish I would have read the reviews before I bought this, I just happened to be in the store and saw this and thought it would be convienent, oh how I was wrong.