This location is a brand new store that just opened up in the Epicenter. You can get to it by taking an elevator that is right on College St, or you can go through the Bank of America Plaza building (the one with the famous disc out front)--go just past the escalators to the Omni, look left and you'll notice a new set of doors leading to an overstreet walkway.
In case anyone hasn't been there, I'll just mention that it's a pretty decent deli. The salad bar is kind of simple, but not a bad option if you are trying to eat your veggies. I like the muffalettas, but if you are not a fan of olives then don't bother. They also have complimentary soft-serve ice cream whether you order the salad bar or not, so that's always a plus (you can even pull a cone while waiting on a to-go order).
Ultimately, the more places that open downtown, the better. As much as it pains me to say it, I think more corporate places like Jason's will actually be good for Charlotte. Why? Because they have normal hours like 11am-10pm instead of only being open for a few hours during lunch--a source of frustration for many who live downtown.