same here, getting a replacement
Just echoing the sentiments thrown all around. I've had mine replaced twice. On launch, my unit would power off and had a light-bleed, curtain effect going around three sides. Took it in the next day and got another one. I had to take that one back because of backlight bleeding AND a torn rubber seal. Because I've noticed "pixel anomalies" more and more while using my iPad, I decided to go back and get a new one.
So, last saturday I took it into the Apple retail store here in Charlotte. The Genius was courteous and amiable, offering to replace my iPad again with no hassle. That day they ordered a replacement and I signed the little sheet authorizing the repair. I chose the in store option as I could retain my iPad while waiting for the replacement to arrive to the store.
Flash forwarding to this morning (Thursday at around 12:30 EST), I checked my repair status at supportprofile.apple.com only to see that the repair was complete... today. Keep in mind, it was 12:30 in the morning... Needless to say I have not received my replacement iPad, nor any notifications from Apple staff. Going to call in the morning to see what is up.
Keep up the good fight, but be reasonable. If you can only notice it in the dark on high brightness you may not need to return it. However, if you are like me and so many others who can see it in regular lighting conditions, I understand your pain.