I'm using two headsets.
One is an Mpow Cheetah; cheap as hell (something like $30? from amazon.ca, probably way cheaper for the USAians), the battery is decent for what it is... good for sports, light, feels secure behind the ears. I like I can easily put it away in my coat pocket and forget about it until I need it, too, the damn thing is so compact.
My other set was a Christmas present but Bose Soundlink II was a pretty decent low/midrange headset. Way more comfortable, the battery is amazing and it sounds way better. But it's not as secure for sportsy stuff - anything other than a brisk walk wouldn't be too great.