So, why am I not rushing out to recommend it, despite how much I love it? The price, yes, but more specifically, the value.
What makes up the cost of a pen? Three things come to mind: Materials, mechanics, and craftsmanship. Let’s break each of these down as they relate to the King of Pen.
Materials: This the main talking point with the KOP. The large 21k gold nib is costly, and I imagine the nib setting and section adds a good bit of cost as well. The barrel is plastic. The same plastic you will find all the way down the line in the Pro Gear Slim model. The 14k Pro Gear Slim is an awesome pen, but it is also $180. the larger 21k Pro Gear Standard is my favorite, and they run around $310. Am I getting two-and-a-half times the pen in the KOP that I’m paying for?
Mechanics: To me, mechanics in fountain pens mostly lie within filling systems. The piston filler in a Pelikan. The vacuum filler in the Pilot 823. The bulk filler in the Conid. A cartridge/converter filling system - as found in the King of Pen - is essentially a lack of mechanics. That’s no knock on c/c filling systems, but we are talking about cost here, and the cost for c/c is far less that the other options.
Craftsmanship: In short, machine-made vs. man-made. Is the manufacturing process machine-driven, as is the case with most of Sailor’s plastic barrel pens? Or, it there a great amount of manual labor, such as urushi artisans applying layers of lacquer to a Nakaya?