These are great sketching...
These are great sketching pens, I haven't tried the bigger sizes, but I tend to
go for Uni-ball Signo bit .18 and .25, the 0.3 Copic Multiliners, Artline .05
etc... I just like very delicate lines, now the Micron 005 fails at this level,
01 is the smallest I can go because just like the Pentel Hybrid Technica 03,
they can't always keep up with how fast I draw and forget about rougher papers.
However, the G-Tec-C 0.25 just flows, it's great for fast lines on most of the
papers I play with, including some hot press watercolor papers. The ink isn't
waterproof, I have no idea about the light-fastness, but I mostly use this pen
for those initial gestural ideas. With a bit of practice you can even get a bit
of line variety. I have used it to take notes, but it's not ideal for that,
it's best for quickly capturing something on a small scale. I carry a sketchbook
in my wallet, so consider that for comparison. I've had several of these and I
didn't realize how much I missed it until they all ran out.
I just want to buy a box of refills.