CM12 is awesome!
Just wanted to post my short experiences in case it help's anyone!
Overall, this rom has been great, I flashed the 12/17/14 version using Phils recovery, I don't remember which version exactly, but its a pretty old one. I always have to go into my APN settings after every reboot, but it connects to 4G by itself after that (albeit after a minute or two). I haven't really used the camera yet, but that looks functional. Otherwise, the rom seems very smooth, animations are great and apps load just as quick if not quicker than KitKat, at least so far. MMS works, though, slowly when connected to wifi. I can receive calls and make calls, unless I am connected to wifi. Then I cannot make outbound calls.
Some other oddities that I have run into are that after a reboot or after app installs/updates, I sometimes get an app FC notification popup, several times, usually very quickly. It happens so quick, I can't see what app is causing it.
I'm not sure if bluetooth is working properly, though it does seem to connect and function once connected. But I need to try on other devices.
I tried to add a trusted device via NFC and that causes the settings app to hang or something, I can't use the settings app again until I reboot.
Battery life seems to be pretty good, about what I was getting on CM11 so I am happy there! But its only been a day or two so we will see how things go!
Great work sbrissen!