I saw them at the Meadowlands in maybe 1988. It was Aerosmith, Deep Purple, and Guns & Roses. Funny part is I went with my little brother, and Aerosmith was the headliner, but neither of us had an interest in them. I was there for Deep Purple, and my brother thought they were flawless. And he was there for GNR, who I was impressed with.
I think we left in the middle of Aerosmith's second song, and were absolutely the only people walking through the parking lot. And I like Aerosmith, but Deep Purple and GNR were so great, and you can only absorb so much music at once.