I built my own electric car:
But my car is fairly limited, with a maximum range of about 20 miles. Still, it works for my short commute. but my wife drives 40 miles per day. We've been examining the possibility of buying one of those cars from "Hybrid Technologies" or "Lion-EV" that are pre-built with Lithium batteries and ranges up to 200 miles. But these things costs $35K to $40K so they are pretty expensive. But if you look at how much gas she spends just getting to work, it is between $200 and $300 a month. I think I could save enough money on gas to make such a vehicle worthwhile. The car payment would be higher, but that would be offset by the lack of a gas bill, and when the car is paid off, then the savings would really start flowing in.
I think the Volt is a good start. But if it is in the price-range they are advertising, I think it will have competition from the other big conversion companies as they continue to grow.
One thing I think they should do is offer the Volt in different forms. A cheap version that has only a battery pack, even if it can only go 40 miles. Then a more expensive version with twice the capacity on batteries OR the gasoline range extender. That way they'd have something to fit everyone's needs and pocketbooks.
Also, I don't know if the Volt's bodystyle is set in stone yet.. but I'm really not a fan. I'd still buy it if the price was right just for the fact of what it is. But they really need a style that is more universally appealing.