Considering that this is an unofficial build of CM12, it's already pretty good. It's workable, but could still use some fixing and refinements.
Here are a few things I've observed:
1. There is always a "!" symbol on the data icon on the status bar despite having network. This disappears when connected to wifi.
2. Every time I reboot, my screen opens with an error message about the settings app.
3. Apps tend to crash. Multitasking is hard.
4. Bluetooth problems.
I hope the devs still work on this since I believe we could achieve at least a stable rom.
Good luck and thanks to all the devs!