You can turn it on while sleeping and not be disturbed by unwanted calls. You can set the time for it and add numbers such as family you still want to receive calls from. I like it because it stops wrong numbers and other calls I don't want waking me up at 3:00 am.
It's great to learn something new everyday, especially in my case when I don't mean to learn something new EVERY day.
As for this topic, I should probably turn Do Not Disturb on at certain times of the day and or night, but I sleep with my phone, thereforee I love getting text messages and stuff. It makes me feel special.