I started with the .3mm lead model. I can't imagine who writes so softly they
don't break these tiny leads on a regular basis. I then moved up to the .5mm
model. It was better but still caused too many breaks for a heavy handed writer
such as I. I am now using the .7mm that you see here. It has not broken once.
The rotating point really does work at keeping the point sharp. I think it is
the best available mechanical pencil I have been able to find to date. My one
complaint is that there is no on-board storage for the erasure cap so it is very
easy to lose.