wow.. this phone is extremely hot when charging with Samsung 2.0A charger.    Unplug it and charge with my computer USB instead, scare to continue with 2.0A charger. 

does it really matter wat type of charger i use??
i using my sgs2/xperia charger to charge....batt life like meh...
in opis now...gonna use the samseng usb cable to charge...or shud i tukar to use the charger that comes along with my fon??   

bloody hot.  I have quite a few gadgets and i do know the difference between normal warm and extreme hot.  I can't hold the phone glass surface to my face for more than 10 secs, just to illustrate.     It is hot at the upper part of the screen, can smell the adhensive of the flipcase heating up. 

Anyway, charging with USB now.   Anyone know the apps that measure battery and phone temperature?  I think measure objectively will be more reliable.

Yes, can easily root it with CWM after flashing stable rom, no need flash any root file. 
Can, just keep the sticker somewhere.

Plenty of reviews and you don't want to read?
Your friend used Mi3 before? Why would you listen blindly?

I plan to upgrade to this phone with my nexus 4,but I'm afraid if there's latest android updates I'll regret,since this is nexus and I need to sell it to invest the money to mi 3