Being my first tablet I have no idea what an acceptable level of bleed is, this is my screen
As you can see there are a couple of spots there but I'm not sure what's normal
Looks exactly like my pic I posted. Totally imperceptible in normal use probably? It's really up to you if you want to swap, but there are a LOT of iPads that look like that out there. Just look at the macrumors forums, people are going through so many swaps that the apple store is telling them they can't open any more.