The company sent me an F instead of M but I ordered me a discount, and finally I'm very happy. The cons: the pen (mini size but effective) out through what is normally the top of the cap, the clip may hinder the holding pen for some (personally, I support my finger on it and not feel any discomfort, calamitous my writing being even slightly improved); pen takes several weeks to arrive; Japanese F corresponds roughly to a European EF, hence the careful choice of M, prudence canceled if they send you an F instead. Advantages: customer service will make you a discount in case of error; the pen has a nice pen (subjective judgment, but I'm not the only one I would say it is a pleasure); the closure system is convenient and efficient, and I have not had dry pen problem; the Decimo, thinner than the other Capless has elegant lines; quality is noticeable.