It's that time of the month again, CyanogenMod ROM fans. In fact it's a bit past that time of the month, reportedly thanks to a heavy workload and the Labor Day weekend, but now that the CM11 monthly update is up to the M10 release, we won't hold it against the CyanogenMod Team. The biggest change to the M build is a brand new bug tracker app, which makes it easy for users to submit anonymized bug reports to CM along with a stacktrace whenever a system app crashes.
The folks at CyanogenMod take a long, long time to develop a custom ROM before they'll slap a "stable" label on it. They don't make any apologies for this, but if you're particularly impatient for a more reliable version of CM 11 (Android 4.4), you can check out the latest snapshot builds. The "M5" builds are rolling out for some of the better-supported devices at the moment, and more should be available throughout the day.