My Smart has almost 10k miles - no problems...yet (knock on wood). I had a 03 Honda Civic Hybrid with the CVT and I was scared to death of that transmission though it never failed me over the 37k miles I had it (sold it right after it went out of warranty). Also the car was garaged in Florida and at 36k I discovered the mudflaps had worn the paint underneath them and caused a tiny rust hole. Took it in to get it fixed but they were going to make me pay for it - it was the size of a pinhead and maybe cost them $100 to fix it right. That's why I sold it at 37k and haven't gone back to Honda.
Also had an Insight, it had it's unique problem too. Headlight switch went out, replaced under recall after my dad replaced both bulb as I had loaned him the car while I was on an extended business trip for several months.
My parents had problems with their Hondas as they've been long time Accord drivers. Recently they switched to a Passion and monthly get calls from the Honda dealer saying its time for them to update their 03 Accord which is like brand new. This last time they mentioned my rust fiasco to the salesman and said they wouldn't be back just because of that. Anyone want to buy a very nice babied low-mileage 4cyl EX Accord?
By the time you actually get a car a lot of the bugs should be worked out, but like I said - I have 10k miles so far on mine trouble free. (knock on wood again!)