My three favorite writing implements are my Twist-Erase 0.7 mechanical pencil, my Precise V5 rolling ball pen, and my Cross fountain pen. Each has its own advantages and disadvantages. But in terms of ease of use I prefer the Twist-Erase. I just wish the marks were darker and that they did not smudge. I'm curious what others in the pen and pencil camp use. Also I'm curious about the question of bound vs unbound notebook, paper size, and whether you scan your paper notes for archival purposes. Is there a pen or pencil technology that combines the ease of use of Twist-Erase but which does not smudge and makes darker marks? Sorry is this has been asked before. I could not find it. Please delete if it is redundant.