There is going to be a high level of threads detailing iPad screen differences, dead pixels, and the all too familiar "I'm returning the iPad" threads.
I'll be happy as long as there's no issues with the screen, particularly something under it. I went through three iPhone 3GS's and the one I ended up keeping has one speck of dust that can get annoying at times. I will complain if quality control for the iPad is the same for me .