What can I say, it's a moleskine product.  As an engineer, I tend to stay with the squared ones.  Perfect for notes, meetings, designs, diary, etc.  Better yet, research and you'll likely find a moleskine product for your use:  smaller, larger, ruled, call outs, blank for art portfolios, and much more.  Ive been using these since the 90's.  Never throw them out;  a nice option to reflect on years past and see what you've done over the years.  Virtually indestructible.  One personal dislike is that I don't lie the soft back option.  Some do.  Never travel w/o one.