So grateful that there's a local Portillo's now! I've been with people who aren't from Chicago and they thought the ordering process was weird, but to me it was normal since I grew up with it. Portillo's has it down to a science on how to get orders out as efficiently as possible regardless of how many customers are there. The only thing I order is the Italian beef with hot peppers on the side and it is exactly like the sandwich you would get at a Portillo's around Chicago.
The only con to my review has to do with the physical location of the restaurant itself. It's in a really weird corner of Tempe Marketplace which is hard (or maybe not possible) to get to from the main parts of Tempe Marketplace without going on McClintock or Rio Salado.