Good luck to him but I'm very sceptical about their product.

When I leave a device charging overnight and I unplug it in the morning, I like that it's fully charged and ready for the day. I wouldn't want to use a charger that switches itself off meaning that my device may have discharged maybe between 5%-10% when I want it to be at full capacity for the day ahead of me. The excess power used by trickle charging costs peanuts and gives me extra assurance should I need to use the device heavily that day.

I'll give them credit for at least trying to do something to tackle the world's energy problems, but to be honest, there are far more interesting projects in that area than this one.