My S7 has been Running Ultra Smooth on 7.0 I cleared the cache right afterward but i'm gonna hold off on a FDR & see how it goes.
It almost feels like a new phone, worth the wait so far
Some users Factory Data Reset after a major update, but that's up to the end user.
If you do FDR guy's BACKUP FIRST!
Even better research the heck out of it First.