Tldr? Dont buy this app- they only want to sell you the new ios7 only upgrade. Buy a competing product.
Long time user of this app, its great they have an ios7 version but this is a paid app. Stop putting ads in it. Stop sending me push notifications to upgrade. Im running iOS 5 and 6 on some devices and cant upgrade, maybe (heres a thought) check the os version before prompting to buy something that wont work anyway.
The push notifications were the last straw for me, time to switch to a different app.
Datnewf about Buy Me a Pie! Classic - Grocery Shopping List, v3.4.4