Have ate at Quesada a couple times now, and have always left happy. The burrito's are HUGE and they PACK IT UP with the good stuff (love the pickled onions by the way - you won't see those used at many other places). Warning: if you ask for spicy hot, you will get spicy hot. The quesadilla's are also super tasty (just so you know).
I'm pretty sure I'd recommend this place over any other Mexican Fast food joint in Calgary. There is seating inside, not much, but enough :) Also, the staff here are really neighbourly and I like that!
Great addition to the downtown core! I'll be back.