Hello. Not the kind of product we use every day: after the third use, but out of the product back window, no longer works (short circuit?), So the fault of bad luck? Want to believe in light of other comments, even if the opinion is mixed, do not notice any defect. I'll take one, but if it happens again, this mean a recurrent fault and I can only strongly advise against this. Apart from that, when working, extremely satisfied because convenient and compact in a vehicle, no need water, etc. I put the same flat than others: you know your baby, so to start heating, anticipate a 20aine minutes time to give the bottle (more if the bottle out of a refrigerator box, I personally advise you to prepare the bottle in the car).