I downgraded my Mini 4 to iOS10, but I have left my iPad Air2 and iPhone 6S on iOS11. The mini 4 is just for couch surfing and some reading, so not as critical to keep it updated. My Mini1 (now sold) turned into a slug. I hated it after its last upgrade (9 or 10, cant remember) but the new owner was very happy with his purchase. I think its a matter of what you get used to.
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