I don't think there has been a substantial fix since nightly #7.
It's pretty good. Surprisingly good. I have slightly more battery drain than stock GB - which, for me, had excellent battery life. This has merely "very good" battery life.
I get the occasional spontaneous reboot, maybe once a day. I tried turning off Tasker to see if that was causing it. I'll post an update maybe tomorrow if I still haven't had a reboot, but it's been 24 hours with no reboot so... we'll see.
LightFlow does not work, which is a major bummer for me. I love that app. The author has indicated he has a major release in the works so we'll see if that fixes it.
The responsiveness of the system is astounding. It makes lots of tasks easier. Cursor placement, for instance - you don't realize how much even tiny slowdowns affect precise movement.