Hi, I'm new to this forum. I bought my 32gb wifi only iPad with retina display about two weeks ago, and have went through 2 exchanges. All of the iPads I've had either had dust under the screen or wi-fi issues. On my attempt at a 3rd exchange, I had the opportunity to open 2 iPad, and both had more dust under the screen than the one that is currently in my possession. The apple store employees said I am not allowed to open anymore iPads, and was given the option to either exchange it for one of the opened packages, or return my iPad. I opted to keep my current iPad, white 32gb model wifi only, instead. I've used my iPad for a week, and when I was watching a movie, I noticed the screen exhibited back light bleeding on certain parts of the screen. I'm wondering if I should go for another exchange and hope that they've received a second batch or just wait a month or so and arrange a genius appointment and get it replaced with a replacement model. What would the best idea? Also I've experienced the problem where while watching a movie, when there is a dark scene, the screen of the iPad would constantly "pump" the brightness. Please note my last day to return or exchange my iPad is November 22, 2012.