RUN!
You only need to know one thing..
DON'T DO THE "UPGRADE"
I have 2 At&t Note 3s... one now 5.0 and other 4.4.4
In my case:
30-40% less battery-life directly correlates relates to OS (not other apps) using 30-40% more RAM at idle. Android 5.0 is using 1.1GB at idle!!!!! Just the OS, no apps. Not 1.1GB total system use... just OS. In my case my phone went from 1.4GB total at idle to over 2GB and that means when I actually opened apps it started to significantly lag as phone approached 2.78GB limit.
AnTuTu benchmark scores DECREASED by several thousand as well.
It probably is an AT&T & Samsung ruining Android 5.0 instead of the other way around, but regardless... DON'T "UPGRADE." :'(