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A lot of music players will be slow when starting if they have huge libraries, but CMus starts fast no matter the library size.
Pro Does not use a lot of memory
Cmus only uses about 15 MB. This is a very small and light media player, which is ideal for people with low end hardware.
Pro CLI only
Pro Open source extensions and scripts
Pro Customizable keybindings for a personal experience
You can add keybindings for just about anything - including seeking (forward/backwards 1 minute, for example) which isn't supported by all music players.
Con Difficult to use
Cmus uses odd keyboard shortcuts such as "C" to pause, "E" to add songs to queue, and "4" to edit the queue.
Con CLI only
No graphical interface is available for cmus. Everything is done through CLI (command line interface).