Firmware Cyanogenmod is much more than just Android, with it you get a bunch of new features. For example if your device is no longer manufactured the official updates, and iron on it powerful, you can set Cyanogenmod which will be the latest version of Android.
Cyanogenmod change your interface with new themes. You can make a very profound change – icons, fonts, boot animation, sounds and much more.
You You can create their own configuration profiles and switch between them depending on the situation. For example change the brightness in one click, the sound, turn off wi-fi, GPS and more.
In general Cyanogenmod is solid pros. Install firmware can even an ordinary user.