Just a post as this seems to be the only place where people can talk about bugs and such;
On mine, the nightly from 1/27 worked reasonably well except bluetooth. I liked that google voice search worked even when plugged in a car dock and the phone connected by BT! woo hoo. The problem I was having with BT was that it would not reliably connect back to the car. I tried snapahot M3 and it was worse. I could not get a BT reconnect and now google voice search no longer worked when in the car dock. In CM11, CM10.2 and CM10.2.1 you cannot turn off the car dock audio if it is connected and the a2dp audio only sporadically would connect. I will wait for at least an RC before I try again. It looks like 4.4 is a significant change and a lot needs to be adjusted. I get random reboots with 10.2.1 and was getting them in the short time I was running 11. To me the most stable was CM10.