Bikes from the People's Republic of China are of widely divergent quality, as are the parts and services organizations. The Tao Tao brand seems to be one of the better ones. There are a lot of dealers, and the scooters are becoming common enough for the brand to be establishing a credible footprint.
If I were looking for an inexpensive Chinese scooter for a teenager, Tao Tao would probably be at or near the top of my list. But I'd buy it from a dealer with a parts inventory, not from some Internet site.
...Operating with impunity in the legal gray area between bicycles and motorcycles....