I am using this phone as my primary device from last 2 months. I don’t face any problem in this phone. It is based on stock android and Android one project. where we will get the latest software update faster. I like the camera of mi a1 because we can click the photos like DSLR. With 4gb of ram amd 64gb rom I did not feel any lag in this phone . I like the built quality of this phone. Bar I didn’t like the fact that it comes with thick bassels