I use to warm the bottles with warm water boiled in microwave. I did lot of research on these low priced bottle warmers and I found this as the best. I wanted to give it a shot. I am glad I did; it is really very nice and quick. Like every newborn, my baby also does not give time when is she hungry. For all my 4 oz quantity bottles, D setting suits very well and I don't need to play around for the water setting. I definitely recommend this to every one.