Interesting book. Well, on one side I have my electronic GTD system that I use every day, but on the other side I decided to try out to use one special BuJo for every music instrument that I'm learning. So I can put practice trackers in there, maintenance notes, set small practice goals and document progress. Looks interesting and the handwriting aspect of this forces you to focus on the BuJo without disctractions that you usually can't avoid on a PC or other computerized gadget.