I have completed three courses now including Nitrox will be the first to admit, the only time by logbook reflects the different groups are when the instructors made me use it. I actually would have to invest time into even trying to remember how to properly fill them out. I am one of the many who no longer fill that part of the log out, since now i load my dives into Macdive, print out the profile and maintain my notes on the pages. This is also cheaper than buying the log book pages as you dive more.