From what I've been hearing, from buyers and Chrysler sales people, they're doing awesome in dense urban areas-New York, San Fransisco, Washington, Toronto, Vancouver, ect, and selling like crap in smaller cities.
Basically, anywhere where people worry about the size of parking spaces and the city efficiency of their vehicles, it's doing great, because it's tiny, efficient, drives really well and looks cool. For areas where people prefer larger vehicles and have the space to park them, they're not doing well.
Which is pretty much exactly how it was predicted, and how it's being marketed. You're not going to see them running around the deep south back country, but when I was in Toronto for 3 days on vacation, I saw about a dozen on the road-and I can see why, they're great to have in a dense urban area.
It's definitely going to be a polarizing car-you either love it, or hate it. Just like every other car in the segment.
As a side note, all the car blogs I've read that have driven the EU versions and the NA versions say that the NA version is better in every way except raw fuel economy. But ours turns harder, accelerates faster and is more comfortable. 'European handling' my ***.