I want to share some impressions as well.
Love the fit and ergonomics. I'm not a fan of metal bodies, though. Can be cold and the stainless steel usually scratches quickly. So I wouldn't mind a plastic version of this design. The Falcon Pro look quite bling-bling and flashy. I don't think anybody would be surprised if these were priced above Campfire IEM.
The housing design is crazy. All these ports look awfully interesting to experiment with. On the downside, it impacts the isolation. You don't really get a closed feeling with the Falcon Pro, which can be a positive for many, but for me it also means that surrounding office noise is too high, for me personally.
Regarding the sound, based on the frequency response curve, I was expecting to prefer the Transparency nozzle. The tonality is very good, but I also found the contrast of lows and treble to be the strongest with this one. The Reference nozzle sounds warmer but also a little bit more homogenous, maybe? I am still tip-rolling and jumping back and forth between the two. The third is too warm for my taste.
I find it really interesting what the nozzles tell us and how much they can change the perception. Length and width are an important factor for tuning. The ear tips basically have a similar effect so there are countless ways to tweak the sound to one's liking. So this is a very interesting product!
I know 2020+ is all about Harman but there are still quite a few people who will disagree. Objectively, sub-bass boost does not belong into an IEM – it's a preference choice. And if you were to use accurate near-field monitors on a desk, what you receive has an upper bass boost – this is a reference for many in pro-audio. The DUNU Falcon Pro also has this voluptuous upper bass boost that creates a full sound. I dig it and I liked it with the Luna, too. It's punchy and has decent oomph. I consider these IEM to be slightly warm opposed to bassy. Is it completely free from bloat? Not really, but I don't consider it to be a big issue.
I really dig the midrange! And the transition into treble is excellent with all the different nozzles.
This single-DD has higher resolution than many multi-BA priced higher. I can hear small cues perfectly, but the Falcon Pro never distracts from the overall composition. There's intimacy with amazing depth and insane stereo width. This is a soundstage killer!
I'm still experimenting, but I really like the Falcon Pro so far. Transparency nozzle + warm ear tips or reference nozzle with short ear tips? Hmm, needs more comparison.