Anyone wondering, it's performing faster than 4.2 on the gnexus imho. Battery life is the same though. Superuser is problematic unless you undo a change in one of the /davlik files[1]. That makes the system partition mount without nosuid as it did before Android 4.3. The other solution is uglier, using SuperSU (which is closed source) and runs as a hacky service that most apps are not compatible with yet.

[1] https://android.googlesource.com/platform/dalvik/+/9907ca3cb...