Alas, 3 hours old and I think this one is going back.
Yes, I am extremely fussy I do admit so hopefully everyone else will be happy with theirs.
I deliberately haven't been inspecting the screen as I didn't want to find any issues, but after one hour I found a dead pixel, then an hour later a piece of dust that makes it appear like there is a dead pixel, and just now discovered a small area the size of maybe 3x3 pixels that is brighter than anywhere else on any coloured background. It actually looks like something is poking through the back of the screen weirdly (or a cluster of pixels are super bright).
EDIT: GPS gets no lock. I don't know if this is simply a software issue or a problem with my tablet. Any have a working GPS?
Oh well! Looks like an exchange.