SMART buy YES or NO ????

Hallöle, I would need your honest opinion and a few tips. EIn very good colleague of mine, has put himself in the head to buy a Smart (max 10.000euro) ,possibly a convertible. Unfortunately we both really have no idea of Smart at all. I would like to have some good tips regarding -which Bezin model is good -where a Smart is vulnerable -which one has to pay attention to -how long such a Smart (motor) keeps -how expensive the maintenance is -usw etc from you! Thank you already times and love greetings Michel