Very nice service. Gets you where you need to go for free. However, even the scum of the city uses this service as well, so don't expect roses every time. Some drivers are horrible, some are so sweet it's painful. Has it's ups and downs.
Caution: Terrible drivers means TERRIBLE. Had a female bus driver SCREAM at people to hurry, and i mean scream. I've even seen drivers refuse to drive until everyone greets them lovingly. Very big roller coaster, but it's free.