I used it on a trip with my girlfriend and we were very satisfied. The battery lasts quite a while and the heat it gives off is sufficient even at levels lower than max. The best use for me was to leave it at the lowest setting and "forget" it in your jacket pocket. After a while, the feeling of putting your hand in your pocket was perfect. The only negative is the charging, for which you need the cable that comes in the package, as well as the fact that each one charges separately, so you need 2 chargers to charge them at the same time. Personally, I didn't find this enough to deduct a star, as you can keep the cables together in the pouch provided for transport.