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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
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, 4 to edit the queue.
Con CLI only
No graphical interface is available for cmus. Everything is done through CLI (command line interface).