I went to the Burnsville La Hacienda at Willams and County 5. They had a $1 special on Tacos Al Pastor. They didn't skimp on quantity, but the meat was a bit on the dry/flavorless side. Not horrible, not inedible, but not amazingly great either. Last week, I had some from their truck on Marquette at lunch and it was a similar experience.
I much prefer the Tacos Al Pastor at Adelitas or Los Ocampos, but they cost $2.