I was tired of constantly charging my oem battery every night after a family outting and making sure it was fully charged before every event. This dual pack works great because I can easily rotate among the 2 aftermarket and 1 oem. Best of all, I can't tell the difference between battery life. I take anywhere from 50-140 pictures on family outtings and about 10 mins of 640 video on my SD750.
I expected any replacement battery for my SD600 to cost so much more this this product. I purchased 2 sets(4 batteries),original no longer holds charge. These seem to last longer than the original ever did. These and 2 new 2gb cards and the camera is better than ever.