I was able to visit the Fuel Cell Development center when I visited Germany last year. I saw all of the vehicles that they show in this video and went for a ride in one of the fuel cell equipped B-Classes. It was seamless, impressive and entirely believable as a daily driver. Mercedes has also put fuel cells into commercial busses and delivery vehicles all over Europe. As this technology gains recognition and passes all of these tests it may become the most viable of the alternative fuel sources available now.