This is an amazing pencil if you're into gadgets and technology, because the
rotating clutch mechanism is exposed through the clear plastic of the grib and
you can see it working with each contact the lead makes with the paper.
The slight edge near the bottom of the grip and the rubber o-ring there make
holding it fairly comfortable, but there are also a few issues.
First, the lead breaks fairly easily. I don't know if that's generally an issue
with 0.3mm lead, but it seems to require a very light touch. I also find that
you can't get through very much text or drawing before having to reach for the
pushbotton to advance the lead - again, maybe something that all 0.3mm pencils
have in common. I don't have another one to compare it to.
Overall, a fun conversation starter of a writing instrument with a fascinating
mechanical feature you won't find anywhere else.