1. Its faster (tested on Nexus 5, and nexus 7 2012).
This is most notably seen on nexus 7 2012, that was sooo slow on 5.0.2 (and all the other Lolipop versions before).
2. Looks like the terrible memory leak is still with us, but it somehow has less effect on the device behavior.
3. It seems like the battery drains faster
On the down side, smatlock does not seem to work (at least on n5) and trusted face is always crashing.
It also have the same freezes (as the old lollipop versions) that must be solved by long pressing the power button to restart the device.