I have iphone 4 and it runs like crap now. Ran perfectly before.
Mrs has 4s and it seems to run fine with it.
Ipad2 runs like its from Microsoft now. Freezes crashes etc.
Basically since Steve Jobs passed away apple have lost the plot. Ios7 ultimately is complete and utter rubbish. I kind of feel sometimes like going in the apple store and hitting an apple employee over the head with my frozen screen ipad.