Comments about Panasonic Panasonic DMW-AC7, AC Adaptor for DMC-FZ7 DMC-FZ28 & DMC-FZ50 Digital Cameras:

Good power source. I use it while I transfer pictures to my computer or while taking flash shots indoors.

Cons:
Sometimes it can be hard to insert the power connector on to my DMC-FZ7 camera. It can also be hard to remove it. I have found myself a couple of times tugging at the cable to disconnect it from the camera! Also, the adapter sprouts many cords which can get in the way.

Bottom line: If you need constant electric power for a long time, then this is the product to get.
If not, then just use batteries.