Superb. I work in South End and used to live in Elizabeth, so I was pumped when I heard a new Bang Bang was coming to the area.
I ordered the Pimento Burger with fries to go. The burger was a perfect medium rare. Enough juice left to be messy, but not enough to run down to your elbows. Fries were delicious.
They have a cool atmosphere in there as well. A couple TVs were tuned in to the Masters. Plenty of seating, but I imagine it gets crowded when they get busier.