Did not notice significant changes yet. Lollipop was flawless too so, its hard to tell except the cosmetics. Need to check the battery power consumption.
By any chance do you know if the s6 from tmobile with baseband version G920TUEU3COK1 will get the update?
I have also downloaded and install new update in my s6 t mobile. It is good.
In 5.0 ram was 70 % used all the time. Now it is almost 1 gb free approx. My storage was same before and after update.