This is really cool!!
I was expecting at the beginning of the article that the device would require more effort while walking, else where is the power coming from. However, if you read the article, the claim is that it is actually reducing your effort while walking since you need the effort to slow your leg down at the end of the stride.
This would be great on some of my trips where power is often hard to come by. I could be wearing a couple of these and the backpack generator and get 30 watts for charging my camera batteries. This would be great!!
I bet it will hit markets just about the time that point and shoot cameras get good enough so that I no longer need my 30 pound backpack worth of optics and camera gear. If these get here sooner though, and the price is reasonable, I’d definitely consider both the knee generators and the backpack generator.