Always busy but incredibly efficient. If you haven't been to Portillo's yet....GO! I always get the Italian beef (add hot pep, moz, grilled onions and gravy on the side), fries and a root beer. People love the chocolate cake (it's fine...but it's boxed cake and canned frosting so let's not get too excited), but I would say get a shake or malt as a treat instead. I could eat here multiples times per week if I didn't think it would kill me.
Also, if you're into salads - the Portillo's chopped is awesome! But let's be real, if you're choosing between a salad and Italian beef, beef will always win!