My Smart Passion Cabrio just turned 2000 miles. Absolutely no problems so far. My wife and I both love it.
The more we drive it the more we like it. I have even come to like the transmission - leave it in auto most of the time, but when there is a need to hold a gear, or downshift for a planned acceleration to pass or enter freeway I slip it into manual. Around town and for short trips we prefer driving it to either of our other vehicles - a 2008 Cadillac STS loaded with all bells and whistles, and a 2002 Escalade.