Any one out there own a Smart Car?

smart car

Does anyone in this community own a Smart Car or knows of someone who does?
If so, what can you tell me about them? Given the cost of gasoline these days, I am giving some serious consideration to purchasing one.
How are they on gas mileage? Can two people drive a long distance in one of these, say on vacation, and continue to remain on friendly terms when all is said and done.
If I overlooked anything, please feel free to offer me whatever advice you deem prudent.