It was successful for me because I had a pretty big issue with a genius being rude to me and denying me service, when I could clearly here him giving another lady an exception for the exact same thing. I called him out on his double standard and said it was discriminating against me. Yes I was a bit overboard, but when I asked for their names, they covered their badges! Like they were LAPD or something. It was crazy. I filed a complaint and the general manager called me to try to appease me and I was able to swap out my black iPhone that had issues. He asked if that made me happy, I said no. A white iPhone would make me happy, and he said most certainly.
If you cause a stink due to truly legitimate reasons, then they'll give you the world. Just a ****** experience to go through. Of course those geniuses were never seen again.