Never heard of them around here. Where are they?
California, Arizona, Nevada, Utah, and now, Texas.
West Coast, Mountain states and Texas. I’ve only visited them in California. You can get several variants of the same basic burger/cheeseburger, fries, shakes and soft drinks. They are clean, fast and crowded. In the Chicago metro, my favorite is Portillo’s followed closely by Mickey’s (love their Gyros) and Nicks.