The 0.3mm version is just a few cents more if you like a finer point. I used one like this for several years. The 0.7mm version looks to be as cheap as the 0.5mm version, FWIW. For larger lead sizes, the auto-rotate is very helpful.
But, my new favorite by far is the Pentel Orenz 0.2mm (PP602G). It has such a fine point, that the auto-rotate of the Kuro Toga isn’t necessary. It has a smooth ended retracting sleve which holds the exposed led and keeps it from breaking. It takes a while to mentally adjust to writing with the lead not sticking out. You will want to click it to expose more lead, but that just lets it get broken.
Sorry, no Amazon link for that, but I got mine from Jet Pens along with all the other cool Japanese import writing utensils and supplies that I need. I make a big order from them every year or so to stock back on odd lead sizes, strange ink color refills, and to see what’s new.
