I have eaten a few times in the past couple years at the Tortilla Factory and the food was always good and reasonably priced. Never had a bad meal there.
This is also the home of the very active Reston-Herndon Folk Club, which holds its Tuesday night open-mikes there. I've played at the open mike many times and always liked the atmosphere. I hope the folk club can find another location that is remotely as good.
Here's a video of me playing a couple months ago at the Tortilla Factory:
http://www.youtube.com/watch?v=1tA50DV488Q
I will miss this place!