I bought a handful of weights of blue Jetstreams, Acroballs, Vicunas, and
Surais, and the 0.5 Jetstream was my favorite. I'm heavy-handed so I found some
of the other pens scratchy, but this one was just right. The ink doesn't smudge
at all, which is great for lefties. My only complaint is that the cartridge is a
little loose, so there's a slight tactile sensation when the point is placed
down/up. I remedied that by wrapping a few layers of tape around the back end of
the cartridge to thicken it up and keep it from wiggling around in the barrel.