I love this place. I live in LA now and every time I come to the Bay Area I have to stop at a HTB. They have high quality food. You can put anything you want in your burrito... If you are really hungry check out the Godzilla, 2 lbs of happiness in a tortilla.
Sure, you can go to Mission and get something more authentic but nothing in the Mission is as fresh. HTB uses very high quality meat and don't use any lard or other bad for you stuff.
I have eaten a burrito places everywhere and I always come back home to HTB for the perfect burrito.
High-Tech is pretty cool. The burritos are big and filling. And many are actually quite healthy, if you go shy on the cheese, sour cream and guacamole. The meats/fillings here are fresh and I love whole beans (black or pinto) rather than re-fried. Prices are little higher than I'd like, but not that bad.