I just noticed that my two Playbooks, a 16 GB and a 64 GB, have different color tints/temperatures:
16 GB - more yellow than the 64 GB
64 GB - more pink than the 16 GB
It's not an issue, as I'm not expecting to do serious color work on it, but just something interesting to note. I wonder if there a similar display variation among other tablet makers. (Yes, I've heard about the Nokia Lumia issues of late, but Nokia is fixing that.)