I restored and haven’t noticed too many random slow downs and glitches. Battery life is good too. Look at all the other guys who updated OTA.
I updated OTA and other than the first few days, haven’t noticed any slow downs or battery issues. There’s occasional display glitches, but that happens after every .0 release and I’m assuming they will be fixed by the .1 or .2 release.
Despite what the Apple Store employees will tell you it’s extremely difficult to corrupt an OTA iOS update as it is signed and verified. There may be existing data on the phone that can cause issues, but doing an erase and then restore from backup usually fixes that (assuming it’s not an iOS bug). Many times Apple will fix it in later updates (for example the iOS 9 Game Center glitch).