I'll say this about 7: when I was running 3-6, ZIPPO problems.
Literally none. Now? Now with 7, I get crashes every day.
Yes, I have the lastest .n version. And I have an Air!
I'm talking crashes with NOTHING else running in the background,
crashes with simple apps like "Photos" & "Safari", again, WITH NOTHING ELSE RUNNING IN THE BACKGROUND.
iOS 7 stinks.
Jony Ive's pinnacle was the late 2008 MacBook Pro. Since then it has been steadily down hill. It is time for new blood, maybe even blood that smiles!