I am using this device from a couple of weeks.It gets heated up very easily and battery backup is not good.It heats to a extent that you cant even put your finger on the fingerprint sensor.It gets discharge in 5 hrs on normal usage.The 2nd sim slot is a hybrid sim slot so if you want to increase the device storage you cant use 2 sim cards.Another problem is that 3G is not runnig fast.Previously I was using lenovo smartphone it was giving me speeds upto 1Mbps.And sometimes the applications crash in between while switching.