The broken entry for the splash screen means that you will get about 5 seconds of a blank screen after the Samsung splash screen and before the CyanogenMod splash screen shows up. That's normal, albeit a little disconcerting.
This is still a very early build. Pay attention to what is broken before deciding that you want to use it.
What is working should be quite stable. It is based off of the work I've done on the 8.4 mondrianlte which is very solid.