Saw AC/DC with my family. We had floor seats and the sound and view was terrible. We could barely hear what he was singing, sometimes I couldn't even tell which song it was because the sound was so off. That being said, I still managed to enjoy the concert, I mean it's AC/DC man!! But next time I would try to get seats in the stands rather than the floor.
And as others have said, avoid using the bathrooms if you can. We waited a good 20 minutes or more for the women's bathroom. There were huge lines on either side for a grand total of FIVE stalls.