I've only had take out from this place. It quickly became an office favorite when we wanted to cheaply engage in gluttony.
I usually get the 3 pupusa combo, and it always lasts me for breakfast and lunch the next day. Pretty good for under 10 bucks. They have a good selection of veggie options for the pupusas, but you had better like cheese! My favorite part is the curtido on top. Any form of pickled cabbage makes me very happy.
I wish service was a bit faster though. We usually had to call in our order about an hour ahead of time, or else the person picking it up got stuck at the restaurant awhile.