Great book. It made me aware of how much time I spend on shallow activities, like checking my e-mails, social media and other websites. Cal Newport never gave me the idea that I'm doing everything wrong. Some of his suggestions I'm going to use, some I will not, and that's OK. The best advice he gave me is to really plan moments of deep work. Not doing multiple tasks at once. For me this means: a thermos full of coffee, two granola bars, no e-mail, no smartphone, setting my mind to a specific task and... go!