I know that xiaomi is top of all manufacturer. But this time ONLY THIS TIME I just did not like display brightnrss under bright sunlight. It has hybrid sim slot which you can either put 2 sims or 1 sim and 1 sd car But battery standby and backup was top knotch. Rear camera was bit greeny in default mode. But you can play around with options in it. Front camera was decent and sound output was average . Signal reception was good. It comes with miui 7 with marshmallow and can be upgraded to miui 8. But I noticed some lag in the UI. So verdict is if your main priority is just for battery and normally for calls, it is ok. BUT SERIOUSLY I HATE THIS.