I think it looks great.
Definitely a great concept and I hope that GM can pull it off. I would never have to buy fuel, unless going on a road trip with this thing.
Averaging 12k miles/year with a car that get's 35mpg, at $4.20/gal, it would save over $1,200. A vehicle that gets 15mpg (thing city driving), a savings of over $3,300.
Not bad, not bad.
Nick