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Totally. I have a 4S but I did upgrade to iOS 8. I wish I had stuck with iOS7. Everything got pretty sluggish.

On the bright side, the 4S is 3 years old now, so with updates through iOS 7 I'm still doing better than the majority of smartphones.

Anyone running iOS8 on a 4S should change some settings: Settings->General->Accessibility->Increase Contrast Set to On

Settings->General->Accessibility->Reduce Motion Set to On

Honestly, it doesn't hurt to do that on iOS 7 either.