The overall shape is pretty much exactly the same as the previously mentioned Sailor Pro-gear. But the barrel and cap feature a very nice, classic-looking engraved pattern, something you'd expect on a vintage pen. The pattern is fairly subtle, you won't notice it from afar, but look closely and you'll see how intricate the line pattern is!
The Justus is a pretty big pen, coming close to what I would call oversized! The nib is very narrow, but long, I guess it can be categorised as a number six size. It's also quite a well-weighted pen, though this time it's not the cap that takes care of the weight. The section seems to be the heaviest part, it has metal threads, so I guess most of it is metal, with a resin layer on top. The weighted section makes it very well-balanced, even when posted (which makes it ridiculously long) it stays perfectly balanced and very comfortable to use!
The Justus is incredibly well-built and feels very solid. I know this sounds vague, but some resin pens feel brittle and cheap. This one definitely doesn't! I couldn't find any seams at all, which deserves a thumbs up! Yay!
I really like the design of this pen, I actually even like the gold trims (Which I normally never do!). The pen has a retro feeling to it, due to the engraved barrel and cap, so the gold accents fit the overall style perfectly!
On paper, it all looks very promising. But you shouldn't expect a whole lot of difference between the two options. In fact, there's no real difference at all! The semi-flex nib doesn't actually get stiffer, it just requires a bit more pressure to flex. The writing performance does change ever so slightly though, mainly the flow is affected. It writes a hair wetter when in 'flex mode', which also results in a slightly thicker line width (even without any pressure! You can probably see the difference in the written review, where the first few lines of the 'overall' paragraph are written in 'flex mode')
In flex mode, you can get quite a decent amount of line width variation, however in my eyes the Pilot Falcon (Another pen that can be considered semi-flex) has a bit more springyness to it. Other than that, the nib is very enjoyable to write with, it's smooth, though with a noticeable amount of feedback. The flow is excellent, not as wet as I expected, but still capable of keeping up with ease. It never skipped or had a hard start.
Is this a pen you should get? Yes! Pilot managed to deliver a very nice, extremely well-built pen with an equally nice and interesting nib. If you have the 300 Euros/ 315 USDollars to spend, this is a great way to enlighten your wallet!
Note: this pen was sent to me by Pilot, free of charge, so I could try it out and write this review. I was in no way influenced in the making of this review, nor was I monetarily compensated. The opinions shared in this review are completely my own!