I was there as well, not too far from the front.
Slash is a beast. He held that show together for 3hrs. Axl did (I read) 14 wardrobe changes throughout the night, undoubtedly to get rid of sweat, but also to rest his voice. I noticed they dropped some lyrics/content from some of the songs too.
I thought overall the show was good. I was definitely enjoying it, even though someone decided to throw down the other side of our aisle. My wife (not a gunners fan - just likes their hits) came along as well, and she was pretty impressed at the show. As JB said, Axl's voice was thin when trying to do his high notes/screechy type stuff. His lower notes/deep voice seemed to be really hold together well. He can still hold a note, and he still has power, but the range sounded smaller. He was however into the gig completely. High energy, and you could see he was enjoying himself. Duff looked super relaxed - including a cameo with him singing and Slash joining in on backup vocals for I wanna be your dog. I've loved the Gunners ever since I was 11. This was a definite chance to reminisce,
3hrs was a big show and a big tour for their age. They held it together well.