This has a best of the bunch review, but the elements are a bit far apart in the internal wrap and although able to heat up quickly, they take at least 30 minutes on a car temperature bottle to bring it to an acceptable temp for a hungry baby. If the bottle is a straight sided type then it is more able to pass heat than the shaped bottles. Not bad for the low price, but purchase a higher priced product if you can, unless you can use it to 'tick over' a room temp bottle warmed by a motorway service station. Supplier upgraded free of charge. Service 10/10 after a glitch.