I've never had one but with my new job I don't have access to a microwave. I never know where my next jobsite is, and most likely I won't be anywhere near a gas station to heat up my lunch or hot choclate. I found a Stanley thermos at wm for about 20 bucks and it claims it will keep food and beverages hot for hours on end. I get to work at 7 am and lunch is at noon, winter is comeing and it would be nice to have some hot chili by lunch time, or have some hot choclate throughout the day. So gt tell me about thermos's.