They were on the list of things I'd never thought I'd own, until I received a pair of Hestra's as a gift. I actually really like them. The heating elements are in the fingers and do a really good job of keeping my hands warm. When it gets really cold (sub zero) I'll still grab the big arctic mittens with hand warmers - between the cold temps and the gloves cranked up on high, the batteries wont last the full day. No problems with the battery lasting on the on the medium setting, but the cold can still be an issue.