Crazy busy at the moment so I can't stage photos properly nor write a proper review yet - promise I'll get to it, but for now, here's a brief summary of my thoughts:
Unboxing experience is great (Zeppelin and Co. very graciously filmed an unboxing video with me, will share that when it's ready if I'm allowed) and the included accessories are wonderful.
Stock cable is fantastic both ergonomically and sonically - hard to do better than that at a price point within the realm of reason. And believe me, I've tried! PWaudio's No. 10 is a pairing I really like - slightly thicker bass, though starts to narrow instruments (thankfully, not to the point that it's congested), so not necessarily better. Just different. Liquid Links Evua II seems decent too, but so far I'm not sure I've tried any cable that is a definitively better pairing than the stock cable yet.
The included eartips are probably one of the best pairings for these IEMs - I do not use these because these specific eartips are limited/exclusive to the Project M, and there is no other way to get them (thus I just treat them as a collectible), but you cannot dispute this specific variant of the Final Audio Type Es are brilliant (they do not sound like normal Type Es, either).
Sonically - first and foremost to get the most out of these IEMs you need a very deep insertion, this means you will most likely need to use eartips a size (or in extreme cases, two) smaller than usual. Sound signature tilts bright and timbre is very mildly metallic - these traits are exacerbated to unbearable levels if you can't fit this correctly. Fair and credible discussion on the Project M's sound quality is not possible if you cannot achieve a proper fit.
Once you fit this properly, the Project M is the most resolving IEM at its price point. It beats everything under the kilobuck price range in separation, layering, bass texture (not quantity for sure - bassheads may want to look elsewhere) without controversy.
Build quality is fantastic, and again, on this front, the Project M beats everything under the kilobuck price range. This is essentially a metal IEM housed in a fully transparent resin. No bubbles, cracks or manufacturing artifacts anywhere despite this manufacturing method being a massive PITA. Ergonomics are great as well, everything smoothed down, no sharp edges nor rough surfaces, I don't foresee any reason this IEM could cause discomfort even on smaller ears.
The easiest and perhaps most ubiquitous comparison I can use is the Sennheiser IE600 - which in itself as a wonderful IEM. The IE600 has much more sub-bass and thus is a much more fun listen, however the Project M beats it flat-out in separation & layering. Play a very busy and fast track and this becomes very immediately clear.
The Project M is definitely worth a demo - considering how new I am to the hobby, how subjective this hobby is, coupled with the current cost-of-living situation faced all over the world, I would never dare to proclaim any headphone is a blind buy - but this makes me very tempted to go against my principles.
The asking price for this is a bargain. I don't say that lightly - the product is just really good, and I got the pleasure of a conversation with Desmond, one of the founders of DITA Audio. Hearing about the manufacturing process, and the research & development challenges DITA faced to produce the Project M, I genuinely am not sure if they will profit off this product. I will not recount too much from that conversation here because my memory can't do justice to him and his team's herculean efforts - if you meet him in person, or if you are a journalist interviewing him, this is something worth asking about. I think you'll find that conversation extremely interesting and inspiring.
That said, there are some listeners who this may not be suited for. Bassheads, listeners who are treble-sensitive or otherwise averse to brighter-sounding IEMs, and listeners who want a listen with extremely natural timbre, may wish to look elsewhere. Even then, I'd suggest giving the Project M a shake and a demo. You might find yourself very pleasantly surprised.