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Yeah. Battery life, speed, everything is better on 12. Especially on older devices, like mine (6s). Don't need a new one for at least 1 / 1.5 years.

You must be one of the few 6S people to claim 12 is better. Pretty much all I've talked to regret every going to 11 or 12 on the 6S.

My 6S is doing fine. Got the new battery and i’m good for another year on it.

11 sucked for older iPhones. 12 brought the magic back and new useful features.

12.1.1 that is.

iOS 10 is way better than 11 or 12, especially on battery life. Battery life is terrible on 12 so no I won't and never will 'upgrade'.

Not my experience. SE here, and 12 is great, but suit yourself.