It’s always surprising how many innovations there can be for something as (seemingly) old, tried, and true as a mechanical pencil. The Pilot Opt is a fairy traditional and comfortably chunky mechanical pencil save for its unique advance mechanism. While a standard click-mechanism is available and quite usable (and necessary for retracting), there is also a sliding weight inside that allows the pencil to be shaken to advance the lead. But is this shake advance mechanism (that I don’t fully understand) a real improvement over the standard, or just a gimmick?
The body of the pencil is fatter than the average mechanical pencil and relatively torpedo-shaped, with the thickest part being around two-thirds of the way toward the front and tapering down from there. Forward of this hump there is a (removable) rubber grip section and a metal cone, attached to which is a smaller metal cone that serves as a lead pipe. As far as I can tell, the farthest this pencil can be taken down by the user is removing these two bits, which gets you nowhere. Behind the grip section is a clear piece of plastic with a colored checker pattern (which is black, trying to mimic a “carbon fiber” look. Other syles come in other colors) below this, you can see the black tube containing the advance mechanism. Behind that is a correspondingly colored opaque plastic bit that contains just enough printed information about the pen and holds the attached spring-clip on a pivot. At the very end of the pencil is a(nother) correspondingly colored translucent plastic eraser cover, under which is a small white eraser that can be removed to access the lead tube.
The lead and eraser are what you would expect from Pilot: that is, quite serviceable. The lead is a fine .5 and the one included feels like an HB. It’s a medium hardness and quite smooth, nothing to write home about but nothing wrong. The eraser gets the job done but like many mechanical pencil erasers is entirely too small (in my opinion). This is offset slightly by it not being they type that disappears easily. The push click mechanism is usable and gets thing done, but is a little underwhelming. And the clip is great, being smooth enough to not damage items but strong enough to hold on firmly, while the spring mechanism makes it easier to use and harder to break. But obviously the main attraction is the shake advance mechanism, which works as advertised. A good shake will advance enough lead for one to be able to write, though it might take two to get to a length most people are comfortable with. The advance per “shake” is comparable to the advance per “click” with minor length differences depending on some ethereal power (likely gravity and the external forces you apply). And the weight inside needs to reach both extremes in a short period of time with some force in order to advance the lead, this means that accidental advancement is a rare occurrence, but when intentionally done can be a surprisingly subtle gesture (though it’s still violent enough that people might give you strange looks). I haven’t had it advance in my bag, yet it’s always done so easily when I was using it.
Without its gimmick this is still a solid pencil, though one could argue that its ¥200 (≈$1.75) price tag isn’t worth it without the shake advance (the same for its increased US price of $3.00-3.50) but even then it’s right on the line for the quality (though I wouldn’t get it without the mechanism because of its thickness). But with the mechanism it becomes a fascinating and usable utensil. The grip is comfortable, if wide, the lead and eraser are of quality, the clip is a step up, and the mechanisms work wonderfully. If you’ve been looking for a more convenient advance mechanism and other options like side advance aren’t doing it for you this is certainly something to look at. And while I probably wouldn’t have bought one for myself (it was a gift from my brother when he went to Japan), and indeed I won’t be keeping it in my daily use pencil bag, I had a fun time with it all throughout my testing.