Best OS for home NAS? QNAP's custom QTS os looks great

I am thinking of building a new home NAS to replace my old CentOs one. One of shortcoming of my old setup is amount of tinkering and CMD usage needed to get everything setup.

Looking at the best OS system for home NAS let me to QNAP's custom QTS os for their NASes.

The review and other features from snapshots, backup, Plex media server all sounds great and seem very easy to setup!

Any idea if I should ditch the idea of building my own NAS with CentOs/FreeNAS and go with QNAP just because of its operating system? Anyone know if QTS os really is as good as it seems?