Double posting for more coverage; Sorry if it's counter culture here.
The Expanded desktop is currently kinda broken; It hides the actual navigation bar well enough, but certain parts of the interface still think it is there; For instance, when attempting to place icons on the dock in say NOVA Launcher, the window to place them is insanely small; The display recognizes that the nav bar is gone, but the other recognition stuff isn't functioning. (Other symptoms: The colorization for the Status Bar in Landscape mode goes to fully transparent where the Navigation bar would be; When brought down, the notification tray only goes down to where the navigation bar would be).
Adblock Plus is broken and can't request root; Now, to be fair, this isn't actually the ROM's fault directly, but is caused by the fact that Adblock Plus doesn't list super user request in it's manifest, so SuperUser denies it without giving you the prompt. Or at least that's what I figure the problem is. Adblock Plus needs to fix that.
And then I remembered ART was a thing and decided to Enable it, so the rest of this will be my comments on how ART functions so far.
First thing I notice is that it takes a long time to load up; As expected when you know what ART is, but still, worth pointing out; Don't be surprised when the CyanogenMod logo stays on a bit longer than it feels like it should or that it takes a while to build the apps.
I'm not sure if this is placebo or what, but everything feels... zippy with ART enabled. Like the whole thing kinda just zips along, except for the installing of apps, which takes a bit longer than normal (Though not perceptible for smaller apps).
So... yeah, it works pretty well, mostly. It definitely needs improvement, but for an experimental first build? VERY successful.
One final observation: Bluetooth seems a little wonky and won't seem to stay connected. It connects, but after a little bit just disconnects. I'll investigate this more later.
EDIT: Another observation: The navigation bar doesn't auto rotate correctly, and this relates to why the status bar's coloration messes up. No matter the rotation of the phone, the navigation bar will come from the "Right" side of it in landscape, and the "Bottom" in portrait.