That's very cool to offer the convenience of all three charging voltages so you can charge slowly at home, quickly at work, or grab a fast 30 minute charge on the run in the Chevy Spark EV.
Any vehicle equipped for fast charging at 400-500 volts can have quick charge times like that. I believe the Tesla cars have the quick charge capability. Of course, it is definitely handy to have in a cheaper car like the Chevy Spark EV.
The price point of the Chevy Spark EV is definitely one of the biggest selling factors. As long as the range is decent, I'm positive it will have a lot of sales.