Default 10i vs 10j

Thinking about downloading the newest update 10j from this site as i am new here i do not know if the one available for my D855 32gb.. Currently on 10i which shows it is the newest update.

Question is. Is it worth downloading 10j, as i have no problems with reboots or overheating on 10i atm.... also another question is there any improvements from 10i to 10j ?

thanks.