This pen looks great. And with free shipping (Prime), is almost a slam-dunk for me. But. The pen is designed to be clipped to the cover of a Moleskine, and not the spine! Look closely- if one were to insert the clip into the spine, the pen would protrude above the notebook.
My dream is a Moleskine pen which can be easily & securely clipped to the spine of a pocket-sized book (such is my Moleskine Soft Cover 18-month Planner and Pocket Cahier combo), without severe modding.