I use Liquid JB as my daily driver. Works great, the only things that don't work are the bluetooth (common JB CM10.1 problem) and camera flash (which I don't use that often). Other than that it runs super smooth and fast (with using myfishbears OC and speedscripts) battery life isn't too bad either.
As of now Droid 4 is now officially supported by the Liquid team and hopefully soon the CyanogenMod team, so hopefully some fixes will be coming thanks to the help of dhacker, hashcode and many others.
Give it a try, though it needs to be installed on ROM slot 1, so you will have to move your eclipse ROM to another slot.
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Can you move slots without wiping?
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