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I haven't had any noticeable issues with my iPhone 4 and 6.0.1 but my reasons may not give you any confidence. I rarely use it as a drive-to GPS (got a dedicated GPS in the car). I do use it for lots of Yelp-like store address look-ups or what's-close-by though and that use still works fine in So Cal. I haven't noticed any battery life loss either but my phone lives in a Mophie battery case so that's not a fair test either.
I do wish they would roll out Siri and turn-by-turn to the iPhone 4. But it is also true that those are my only incentives to upgrade, still being reasonably satisfied by the camera in my 4 (my critical use is document 'scan' with JotNot Pro).
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