Allow me my 2c worth.....Isee a pretty good use for the shake light....my 6 year old. In recent power outage situations, it would have kept him immeasurably contented to "have something to do". Don't get me wrong...he has stuff to do and he does have his own other flashlights...some incandesant-most LED. The shake light gives him some 'entertaining' way to provide light.

The one shake light I tried was at a fire scene. One of the FF had one and I was pretty impressed with its output. I still won't go giving up on my other lights though!