It really depends on how you use calibre and how you use your device.
If you seldom change metadata in calibre, don't use or don't care about seeing custom columns on your device, and can live with the search/sort/display facilities the reader app provides, then CC won't be particularly useful. If any of the above don't describe how you want to use your device, then CC could be very useful.
Some people keep hundreds, often thousands, of books in CC, in which case CC's grouping and sorting features are very useful. Some use calibre custom columns to organize their library by genre, by source, by priority, or by other things important to them. CC lets you access and use this information. Some like to update metadata in calibre and see those updates on their device without having to resend the books or remember what was changed, something that CC supports. Some want to manage their device from calibre, which requires calibre to treat the phone/tablet as a calibre device, supported by CC as the wireless device connection. Some like the ability to customize the library display to display the information important to them. Etc Etc.
Perhaps the best approach would be for you to try CC's free demo version and see if it satisfies your requirements.
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