I have been using these little books to record my daily activity, travel, exercise  and  weight since the early 2000s.  I find I prefer the ones with the square grids on them which enables me to write small.  The size is right and it has a classic "feel" to it. These books are like an old friend.  In my case, it helps me control my weight, which hasn't changed more than +- 5 lbs since mid year 2000, and I believe it helps hold me accountable for exercise, food and drink consumption, and valuable travel memories from the past.  Needless to say I have a pile of used ones around, as well as the one in current use.