iphone 5s 64gb here
i havd a hard time believing a company as thorough and thoughtful as Apple didn't have people test out iOS 8's functionality on older models. I am actually shocked at just how **** poor this version 8 update is. It has turned my iphone into a laggy battery draining mess. I will be watching closely to see how fast apple acknowledges these issues and how fast they can put out an adequate update that will fix this mess. If I get the slightest inclination that this was done on purpose to push people into buying the new iPhone 6, I will not hesitate to sell ALL of my apple products and will never give a single cent to this company again. As you can tell I'm pretty disgusted at just how horrible this update was, I was totally not expecting such a colasal failure from Apple of all companies.
the issues I've been having:
battery draining 4x times faster than normal
safari browser has a whole host of issues: running slower, flickering, webpages loading up distorted, slow to focus when zooming in/out, etc.
RAM memory is constantly at 75-80% capacity
iCloud backup not working (i upgraded to 20gb and tried to backup my phone a dozen times even let it go overnight and it would just get stuck during the upload and not move any further)
iphone resetting itself on its own (never happened before)
ibooks & App Store not functioning properly (search bar & navigation controls would disappear/distort)
iPhone itself would heat up and get very hot
I tried to wipe my phone clean and restored from iTunes backup and it didn't fix anything. i am extemely disappointed with Apple snd this whole debacle. At the very least they should give folks the option to go back to 7.1.2. At this point that would be a true major upgrade.