This lead is excellent,...
This lead is excellent, but yes very easy to break with many pencils. For a long
time, I tried, without success, to use the 2B with a Pentel S473, but 2 clicks
would bring the lead too far out to avoid breakage. It eroded quickly enough
that 1 click would result in me rubbing the pencil sleeve against the paper.
Very frustrating, and almost made me give up entirely on 0.3mm (HB isn't
dark/smooth enough in my opinion).
However, with a GraphGear 1000, a couple clicks is just the right length, where
the lead doesn't break so easily and doesn't vanish completely right away. It's
great for situations where I can't sharpen, but want a nice smooth dark lead in
a fine line.
In terms of darkness, it really doesn't compete with the best wooden pencils,
but Ain in 2B is pretty dark and rich. Not a bad lead at all, and one of the
best options conventionally available in my opinion.