Do not update. I am staying on 10.3.3 on my iPad Pro 2017 even. iOS 11 is just not worth it on iPhone. All you get is a new design otherwise it’s functionally the same. You will have your battery life halved and get performance issues and delays and bugs for no reason. Once I get the iPhone X the coming week I will keep that on 11.3.3. I am not letting Apple ruin expensive devices like these. I have already been fooled twice. Not anymore though.Iphone 6s should i update ? I'am still on 10.3.3