I had two in 2008. The first didn't work out of the box, the second broke in a couple of months, and was only realistically usable when charged via the AC cable. 45 mins sound to a minute's cranking is wildly optimistic. Sound was pretty good, video less so. It's essentially the kind of generic rechargeable MP3/4 player you can buy for a few quid in a Chinese market, built into a honking great plastic box with a crank on the back. Menu system was clunky at best. Nice idea, shame about the execution.