The Sky is a good-looking car and one of the more compelling cars from GM in a long time. That said, I'd rather have an S2000 and I put my money where my mouth is. Here's why:
200 pounds lighter, vastly better drivetrain, fastest top in the industry IIRC, much better handling, perfect 50/50 weight distribution with front/mid-engined design, better exhaust note, much larger aftermarket. According to Car and Driver, the S2000 is 0.1 second quicker to 60 and 0.2 second/2 MPH faster through the quarter, and stops from 70 MPH in 17 fewer feet. Available bolt-ons will take you close to 400 HP at the wheels. Huge international community following with regional clubs. Race series devoted to car. Very easy to work on at home. Manufacturer is not bankrupt. And so on...
The Sky has... more relaxed driving in town. Which is about 1,387 on my list of things I care about in a car like this.
It's an easy choice unless you've got a "built in america" chip on your shoulder.