Yep. I was very impressed. It actually doesn't appear as large inside as I thought, but that's a good thing. I attended an event at the new T-Mobile Arena in Vegas back in April and that place is very vast and cavernous inside. We had lower level seats at the other end of the arena from where the stage was located and it seemed quite FAR away. I didn't get that same feeling at G1C. It somehow retains the intimacy we all loved about ARCO II. And I love that most the seating is in the lower bowl.
To me, one of the coolest things about it is how open it is. Not only is the main entrance wide open, when you walk around the plaza level you can still see the action most places. Even in the upper level, you can see the video board as you walk past entry ways. It's pretty slick . Reminds me of an open baseball stadium at the concourse level.
I even took a walk up to to the very last row of the upper level and, while it certainly is steep, it's not a bad vantage point at all.
Lastly, regarding the art piece out front, my wife, step son, dad and I all thought it looked better than in the pictures we'd seen. The color is vibrant and changes as you walk around. I've been pretty indifferent about it, but after seeing it in person -- I thought it was kinda cool and provides something unique and identifiable to the area.