I tried reading Cal Newport's books and have found them terrible, even given the quite low standards of the genre. I really wanted to get excited about the concept of digital minimalism, but his book of the same name was almost completely devoid of insight. I struggled to find any information in it that wasn't already contained by thinking the two word title seemed not-bad as a prospective lifestyle change.
He sells a lot of books, so I guess it's just my opinion, but I keep relearning the same lesson, as the topics he chooses certainly are interesting.