The ForTwo sales have been dropping for a while here in Europe. Safety doesn't seem to be an issue for most people but stability can be. I did see one on the wet, cobbled streets of Edinburgh manage to plow straight on and took out a parked Audi when they first came out.
I had one of these for a while :
http://upload.wikimedia.org/wikipedi...ewoo_Matiz.jpg
which also had extremely skinny tyres and it felt unsafe on those cobbled streets. Mind you it also had a body made of such thin metal that a dent remover working on the bonnet (hood) just used his fingers, no tools!