Phone is too good.
Pros:
Low light selfies are very good.
Main Camera is mind blowing.
Tried playing pre-installed games and was no glitch with casting.
Phone asks for pin every time you restart.
Phone switches off if sim removed and on restart ask for pin.
Ui is too good and fast flowing.
Close to stock android experience.
Working on marshmallow now and will do update today.
Usable memory close to 44GB.
Ultra stamina mode in battery when not is use can prolong battery life to very long extent.( 90 hours was shown)
UCH10 charger in box with QC 2.0 support.
Stock earphones are of good quality with decent voice reproduction and 3 size earbuds provided.
NFC Capable.
Xperia Transfer app helped me transfer all contacts messages and multimedia from my old phone to my new Xperia X.
Cons:
Lot of apps like hungama which are embedded in the os which cannot be installed and only disabled.
Finger print sensor not unlocking on screen off.
Battery when used in normal mode is not giving much backup.
On standby also battery used at 2% / hour in stamina mode.
Sim tray is easy to remove using fingernails and tray lock looks a little delicate.
People who have tried using Redmi phones will not be happy about the backup. But people coming from nexus 5 will feel better as it gives better backup.