I remember the resprings, but only remember having them once or twice a week. I also do remember how my iPad would sometimes get stuck in the app-flying-in animation with the multitasking gesture if you tried to switch pages too fast. It was impossible to get past this and do something else without rebooting. Other than that, 7.0 didn't cause that many issues for me to be completely honest, just really really slow animations and a bit of sluggishness.
Well going to just wait for 9.2 to come available when ever it does, hard rest took care of gray box. I have iphone 6 with 9.02 . can't complain about battery life, I can get 11 or 12 hours, but that is with just texting and checking email, or what ever comes up. Happy with it so far, simple and not a lot of apps I don't need or care to have.
This is the first Iphone for me, wife, & 2 of the kids have iphones. I bought wife a Mac pro air for Christmas last year.
8.0 had the multitasking gestures that straight up wouldn't work very frequently, unusable copy and paste, horrendous battery life on my iPhone 6 (impossible to get more than 3.5 hours), keyboards would, quite frequently, pop up in the incorrect orientation, my iPad would need to be rebooted daily or rotation would take upwards of ten seconds. It also had a glitchy animation, you would immediately get a black border that would rotate, but the actual content wouldn't do anything for like 10-30 seconds, sometimes they keyboard would not pop up for quick reply until you rebooted... The list goes on. I hated iOS 8 up until like 8.2. That was by far the best one for battery life for me, I got 10 hours of use on my iPhone 6 for the first time with this build! Frequently got 8 hours or more. Before that, all I could manage was 6 hours. After that and still this way to day, all I can manage is 6 hours.