I have given some thought to them and have read a couple of good reviews on them on e-opinions.com but have held off because the company has a poor reputation for customer service. This means if you get a bum one don't expect the company to help you out, especially since they are Chinese in origin. Also their S&H is ridiculous and it should not take 6-8 weeks to receive anything in this day in age nor should you have to pay extra to shave off a little time to get them quicker, very shady.
I would rather keep a 3AA Dorcy for emergency needs at this time. I might give them a try when they end up at the As Seen on TV isle at Wal-Mart and Target, should be any day now.