Came here for a Madeon concert a couple months ago and really enjoyed it. The old theatre vibes and architecture set the mood. After removing the seats in the GA area, the floor is slightly sloped providing a great view for people in the back. So don't worry if you're stuck at the back... you have a greater/higher view than the people at the front.
I went to the Hall for the first time not knowing that there used to be seats in the GA area. So i made the decision of staying at the front for the whole show. However, when the show ended i didn't know if it was the old theatre smell getting into my head but the trek to the exit seemed incredibly sloped...
Now i know i wasn't tripping.
Overall very nice hall and the old vibes attract wonderful crowds.