It's unfortunate that they are only here for a short period of time, because I work near Union station and it was my go-to lunch spot. It has a great selection of quality vendors and the food was pretty healthy and tasted great. It even had an Uncle Tetsu tent that didn't require you to lineup at all!!!
They had live band playing at lunch, which is nice and makes a great atmosphere. I do wish they had more seating area though. It was packed at lunch and many times I had to take the food back to my desk :(