I do not recommend it. Apple destroyed my 7 Plus when I upgraded to iOS 11. It went from 2 day battery life to lasting a day. Then they also snatched away the fast solid state home button of ios 10. I hate iOS 11 so much I kept my 2nd generation iPad Pro 12.9 on iOS 10.3.3. Trust me, the visual change’s feel fresh but after a few days the glaring flaws outweigh them.
How did they destroy your 7 Plus? Didn't they replace it with a new battery? Did you check the wear level after?