I haven't upgraded to IOS 8 yet on my iPad mini. I like to wait till the bugs are worked out.
The pixels app is useless for me, except to show my pictures to someone. The activity page just drives me crazy. If I ever have to start deleting stuff to make more room, that app will be one of the first things to go.
I've had a problem with things crashing lately, though. If I open a webpage from a FB link, it crashes. Sometimes Safari crashes.
Y'all please let me know when it's safe to update my iPad :-)