Jay Leno does a nice little review of the roadster on his website
http://www.jaylenosgarage.com/
It's easy to dismiss these cars, but you have to start somewhere guys. And this is pretty impressive for a 'first go' at an eco sportscar. Didn't see 'Top Gear' (I think they are juvenile wankers, quite frankly), but UK's 'CAR' magazine gave the roadster a BIG thumbs up. And they are normally very critical of anything American.
50K is still pricey for the sedan in terms of mass popularity, but I think they'll sell quite well if they deliver most of what they promise. I will certainly consider one, although probably not a 'first generation' model.