I actually went to Philly in November 2012 and had one of their Philly Cheesesteak sandwiches. I didn't go to Tony Luke or Pat's which are the most well known but I did go to Jim's which judging by the celebrity endorsements and their prime location, ranks with the elite.
I believe that "I Went to Philly" opened up around that same time (late 2012) but I didn't get a chance to try it until last week.
The choices are a bit different than what they had a Jim's as they blend both the Cheese Whiz and Provolone together rather than having them as separate cheese choices. The sandwich was devoured quickly and the fries were quite good as well. In case you're wondering about the fries, they fall into the hand cut slightly soggy category which I do enjoy.
I didn't try any of their dessert items but I do plan to be back as the service was friendly. They also have a loyalty card where your ninth sandwich is free (or maybe tenth).
The prices are in the range of a Subway foot long (not when they have their $5 promotion) but they do have a great lunch combo deal where basically for a dollar more, you get fries and a soft drink. Speaking of drinks, this is the first time I had a Yoohoo. I don't drink chocolate milk often but it is very similar but a bit more watered down. I actually like it better.