You can find all the threads on maintenance issues I'm sure. Keep in mind this forum does not have all the smart owners in the USA registered, and the number of cars with problems is a fraction of the over 18 thousand in the US so far. Having said that, it's always possible something may crop up with your car, or any new car for that matter. Over 6,500 miles on ours and zero issues at this point.
As far as maintenance, 10K mile intervals, and most of the items you can DIY. Plenty of info here on oil and various filters needed. New plugs at 30K miles - probably not a DIY for the average owner, but I'm not sure why the short interval anyway. (I'm tempted to run the plugs until they begin to cause problems.)
Several folks here who use your smart center and they will probably chime in with their experiences.
Go for it - pick up your car and enjoy it. Don't think you'll regret it.
