Motorcycle Taxis

I have always heard that they are really dangerous and that I should avoid them. Once when I was really in a hurry by Nanjing Walking street and it was impossible to get a cab I saw an old woman passing me with a bike with 3 wheels and a small seat behind so that my cousin could also join me. The ride was FUN FUN FUN!!!! Also much cheaper than if I would go with taxi (25RMB from Nanjing Walking Street to Dingxi Road), from now on I'm going to try to only go with those.