I've read much debate on MacRumors regarding the $29 Apple Rechargeable Batteries, and I can't decide whether they are worth it or if there are other rechargeable battery systems on the market. I've read they are rebranded Sanyo Eneloop batteries, which I have read are good. I have a bad Radio Shack recharge from a few years ago and the batteries barely hold a charge. I realize they only charge two at a time, but as our household had a plethora of wireless devices I was planning on purchasing two units. Thoughts? Waste of money? Better alternatives?