Texas Horn, It's not that big of a deal, but I have known the owner of the Taco Shacks here in Austin for 5 years, and we talked right before he made the decision to open a new location on the drag. I specifically remember saying he was nervous about opening a new location on the drag, especially because it would be during the summer, when a lot of the students are gone. I too remember there being a mexican place being in that location, but I'm almost certain it was not a Taco Shack. My favorite location is still the original on Medical Parkway, but the one on Spicewood Springs is good too. For you guys that are in the area, they also have a good lunch menu. Nothing fancy, but it's brown and hot, and will stick to your ribs.