I've only tried the grilled cheese and the LOL Philly cheese truck. Both were ok, but nothing that I would seek out again. They're a great addition to the dining scene, but I don't understand the high prices considering their low overhead.
I have my favorites on my fb. They update where they are. I think there is a Twitter handle that announces the locations of all the food trucks, but I can't think of it's name at the moment.