For about the same price...
For about the same price as a "normal" mechanical pencil, here's one that just
I like the lead rotation, even though I tend to hold the pencil at a very high
angle, so the effect is less noticeable. The bigger benefit to me is the slight
cushioning of the lead from the rotation mechanism. I've had no breakage of the
.5mm lead, and I suspect I could use a .3mm without a problem as well.
The design is pretty good, though I wish the clip was removable.
The only drawback I can see is that the lead only rotates when the lead contacts
the paper. Thus, if you use cursive, you'll get 1 or 2 movements per word, while
printing would have 1 to 4 per letter.