Blue Saguaro has been doing the same menu of breakfast sandwiches (seriously delicious - toasted sourdough drenched in salty butter, egg over medium, crispy bacon and melty American but not Kraft cheese) and lunch sandwiches & salads for over 10 years.    There's a reason that it hasn't really changed:  It works. 

The lunch menu has specialty vs regular sandwiches.   Most of the specialty are loaded up with sandwich fixings you're not going to get in a chain shop - cream cheese, sprouts, avocado that wasn't spread on thinner than mustard.   The bread is bakery quality and there's a decent selection.   The ambience is non existent, but when you're grabbing lunch on the run it really doesn't matter.     

They are super fast, but that may be because I always tip a buck.   :)