I am not sure what there is to say as I have been a fan since around '89; when I stepped foot in the original location in Lincoln Park (Chicago,IL) just outside of my DePaul campus.
My daughter had one of her first sandwiches as a toddler(Turkey) from the Clybourn Location and I just picked another one up on the way to her ASU dorm about 17 years later. We also shared a weekly trip to another location while she was in pre-k. up until they opened one in our town.
There is no one better than Potbelly's at toasted subs! They have fooled around with the menu and added multiple options. Original owners sold out and now the chain has expanded throughout the US; yet they still deliver a consistently solid product. Great Work!