I drew my latest picture, "Milky Way" using the Pilot Penmanship EF and the accompanying Pilot black ink cartridge. (I did have a spare Con-50 that I could have used, but I wanted to try out the cartridge.) I am not sure why I bought this pen, to be quite honest. I'm pretty sure I just saw that it was an EF Pilot and was like, "Hey, that is something I want to try and for a super cheap price. Let's buy it!"
In any case, it's been a pretty good purchase so far. The body design is super strange compared to all of my other pens. Because of the way it tapers at the end it looks much longer and thinner than it actually is where you grip it. It is very, very light and comfortable for long use. Obviously it isn't that beautiful, but that wasn't why I bought it anyways.
The Pilot EF nib has not disappointed at all. It writes very smoothly and is soooooo thin! I haven't been able to draw lines this thin since I was using disposable Faber-Castell pens. It's nice to be able to have that as an option even if my style recently has been moving away from thin lines. Here is a comparison of this pen next to my Pilot Kakuno F (same as a Pilot Metro F) and Lamy Safari EF. All in all, if you're looking for a super fine nib and don't care care about fancy aesthetics, I would recommend this pen.
And if you want to see the pen in action, here's a short video from the making of "Milky Way."