According to an owner I had a chat with a while ago, the catch with the Twizy is the monthly battery pack "insurance" which isn't that cheap. IIRC there are two options for a buyer: either pay this insurance that covers everything, including getting a new pack once the old one is depleted, or buying the new pack as a spare part which will cost about half of the car price. All things considered, it's a nice vehicle that is getting some success (I've saw a few during last years) yet still not economically convenient compared to traditional cars.