My 6+ is doing fine with the new iOS9.02. However, my wife's 5 has been acting really strange lately since the upgrade. Her first complaint was the battery doesn't hold a charge. I did some diagnostics and saw that the main drain on the battery was auto lock screen, so I checked it and the setting was "Never" Ok, so I fixed that to 30 seconds to go into auto lock. A day later she complains again and discovered the setting was back to "Never" For some reason the phone keeps changing the setting to Never and the screen stays on causing the rapid battery drain. Last night at midnight we set it for 30 seconds after it was charged to 100%. This morning the battery was 12% and the screen was locked on to "Never" again. Something is causing the phone to come on and then never time out by itself. I'm running more tests today, after we recharge it back to 100%.
Oh, one more problem I saw on the iphone5- Normally when we came into a pre authorized wifi the phone would switch to wifi automatically and when out of range switch back to LTE. Now the wifi will only come on after I switch off the Cellular data, let the wifi come on and then switch the cellular data back on again. My iphone6+ continues to work normally on switching between approved wifi and LTE.