I have now switched out my iPad 8 times. I originally bought from best buy and open 7 brand new machines. Each had it's own problems such as dead pixels, lifting bezel, and backlight bleeding. I finally called apple and they told me that I should not settle for it and make an appointment with the apple geniuses. So I got an apt right away (waited a bit in the store though) and showed my bleeding. He agreed and took out a brown boxed iPad that he claimed was new. So then he took me in the back and let me go into the employee bathroom to check the backlight bleeding. All I have to say is this one is near perfect. The best out of all the ones I had.
So, keep pushing until you are happy
I hope I don't see any problems later on.