Just thought I would add my two cents. I've bought a few flip maps and quite a number of the map packs in the past but it is mainly impulse buying (certainly not regular).
I saw this one advertised in the weekly email, thought it sounded good and really liked the side with the buildings. Momentarily I was thinking of buying both the flip map and the matching map pack, then I saw it was blank on the flipside.
Instant turn off. I've already got plenty of blank grids and absolutely no interest in any more.
So there you go. Would have bought it and the map pack if there were cityscapes on both sides. Not buying now.
No idea how many people felt like me about it. Guess that is for Paizo to worry about.