I bought a Parker at Staples (not IM) and it would not feed ink until you soaked
nib and then it would stop. I took it back. I bought an IM from JetPens and
love it. I've used the cartridge and the conversion unit. Filling fountain
pens can be messy so I pour a little ink in the bottle cap, remove the
conversion unit from the pen, fill it from the cap, wipe it off, install it in
the pen and keep writing. I've written at least 50 pp with it so far and it
keeps getting better and better. So far, my favorite pen.