you are really getting a lot of good advice here.
I hope you are a fast learner as it took me several years, quite a lot of pens tried and time spent reading this same advice, to understand what matters more for me in a pen.
If it were up to me, besides all the things already said, which are essential, types of materials, nibs, filling systems, manufacturing quality, reliability, etc., I would add one less evident factor which sometimes clashes with innovation and the need to show you are different: ergonomics.
A pen is something you hold in your hand, and you use to write with.
It's less obvious when you look at a pen, but it's when you hold it in your hand that you feel the difference.
Too many pens out there are surprising and beautiful, but when it comes to holding them they are just unbearable.
If you have not held hundreds of pens in your hand before though, it might be tough to understand the subtle differences.
It's something you should put at the top of the list though, don't let any other of those essential requirements get in the way of the one aspect which I (and I believe many others like me) consider most important, and that can make me decide not to buy a pen, even a luxury pen that I want and can afford: comfort.
Edited by sansenri, 22 September 2018 - 20:19.