Very reliable and cheap. It gets really crowded and they don't seem too ever reach capacity, they just keep letting folks on. I'm a budget traveler so this really worked for me vs other ways to get around. $8 24hr pass, $20 3 day pass. Those passes are good for connecting buses as well. You can go all around they city. Much cheaper than a cab. The drivers and attendants at the stops were very friendly and most had huge personalities!
Finish those beverages before getting on although some of the drivers let me slide.