When buying a mobile phone in your country ( locally) or from overseas ( via website) , first wait a few weeks to see if there is anything wrong with phone ( network, battery, phone or apps freeze up/hang) prior to applying a new rom ( or rooting your phone) .
If you apply a new rom ( or root your phone) , the supplier or manufacturer will notice it when returning for repair or replacement, and your warranty will be voided.
I have just bought mi5 as I was earlier using mi3 and I liked it most so I trusted company and bought mi5. Most imp is that I was looking for VOLTE handset and when I saw mi5 is VOLTE I bought it but later when I insurted jio sim I shocked that it is not supporting VOLTE and when contacted to customer care then they replied to wait for next update version of mi5 . Now only china updated version is available so I have to wait. I think it was my bad decision to buy this one. If I had to use only data I would have prefer other handsets below 15000.