Chex Grill is absolutely the best place to get Philly cheese steaks sandwiches in Charlotte. My girlfriend and I loved the mushrooms and sauce--there was just the right amount on the sandwich to prevent the bread from becoming soggy.
We ordered the fries with the sandwich, and they were fantastic as well. They were crispy on the outside and seasoned with a good flavor (they also weren't soggy too oily, which was nice).
Conclusion: this is definitely that we will return to within a week!