Seems most of you don't mind having to recharge the batteries frequently? I don't feel like having to remember to charge batteries before a ride. It takes hours to recharge, and you have to take care not to overcharge. Do you guys just plug in batteries into your computers every day as a habit?
Personally I hate wondering if I have enough tuntime so deal with battery capacities that mean I might have to charge once or twice a week max. Not only do I get more piece of mind - the batteries will last longer too. So USB devices with a run time of two hours or less aren't something I like myself.