To be honest it all depends on what you require from a car. I recently imported a Honda N-WGN for my wife. My reason was simple. My wife just learnt how to drive and these little kei cars are easy to maneuver and park in tight areas.
Plus they have auto transmission which is a plus for a novice driver. But if you are looking for a family car that can carry a few people and some luggage etc, I would suggest that you stay away from Japanese 660 cars.
A sedan is a sedan and has many functions that can not be served by kei cars. These cars are built for a different purpose altogether.
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