Wow, a hundred bucks.

One could buy a 5800XM off fleabay or some other SH and have a desktop charger, second battery and an emergency phone all-in-one (5800xm has the same battery). Heck, even a broken one that still charges is nice.

I think for 100 one could get a 3rd party desktop charger and battery.

I see a desktop charger (usb plug, case and logic only) for $3.99 and a BL-5J for 17$. So 21 bucks for a battery that charges from USB.

Also, from $10 to $40, you can buy a battery pack with an USB socket and just charge the device in your pocket. Ranging from 4-AAA cheap to huge-Li expensive, some of those recharge away in the office. (I have one).

I'm not saying the Mugen solution isn't sweet, since there's no rebooting, but I don't think it's commercially desirable (from my standpoint).

Also, I was hoping for a flat cover, flush with the camera. Now it just looks overweight.