I am using this phone last 8 months. Starting I fell it is smooth working phone. Its never lag. Its performance very good. But after 4 months later. I feel some issue in this phone. Like its charger cable broken. Sometimes phone automatically switched off and again switch on. Phone sometimes lagging. But after update phone much better. So I give 3out of 5.
https://deepaksinghapp.blogspot.com/2018/09/review-for-redmi-mi-a1-i-am-using-this.html