Camilo O does a great job of summing up Salazar Brothers, it just doesn't exemplify how much better the food is than F-B's. The food here is unbelievably cheap, and is made very quickly. More importantly it tastes great as well. I usually go with the Chicken Tostada when I go here. I used to always grab a taco or two to go along with it (also quite good), but after having leftovers every time I've found that unless I'm starving, the ridulously-cheap $2.15 tostada is totally sufficient. Two bucks for a huge heaping pile of lettuce, salsa, chicken, and beans!
The environment is just like any other quick-stop Mexican shop, not quite as clean cut as Los Taquitos but not bad by any means.
If you're in the area it's probably the best spot around to grab a bite and run!