Just to throw in a contrary perspective here. These light leak issues are endemic to lcd screens in general. mbps, imacs, pretty much anything with an lcd screen exhibits greater or less light leakage. Some are lucky and have almost imperceptible amounts of light leak. However, you have to consider that if you exchange your ipad, there is a chance that you'll experience worse bleeding and potentially dead pixels. It's the panel lottery. I exchanged 3 mbps in 2009, and all of them had some degree of light leakage on their lcd panels. It's the unfortunate nature of the technology. Now people will probably post after me that they have perfect no light leaking ipads and that you should exchange until you're satisfied. But it all comes down to how much are you willing to live with? There are crazy people on here who have exchanged 9+ ipads and still don't have one that they find to be satisfactory.
