A while back, wife and I took a trip to Honolulu, something we do every year or so. Cruise the island, enjoy the nightlife, and she shops.
Well it was a saturday, and she took off with our rented Dodge avenger (don't ask) to spend my money at ala moana, the biggest mall for 2500 miles. After an hour or so of watching bikinis, I decided to rent an almost new sportster.... until I saw the price of $120 a day! So, I rented a little chinese (or korean) 50cc scooter, for $30.
I had never ridden one before, and really did not know what to expect. But what I got, was hours of good fun. Full throttle everywhere, and no shifting! On the urban roads of Honolulu, it was a great ride, and kept up with-and passed lotsa cars. I could not see taking it out in the country though, just not enough power to feel safe. For that reason, I don't think I'd buy one, unless I lived in a city, then I would not hesitate... but it would have to be at least a 250.