As a IEM manufacturer, I don't think Campfire Audio needs any introduction. From relatively affordable offerings in the Comet to flagship IEMs in the Andromeda, Vega, and now the Atlas/Equinox, Campfire Audio has fantastic products at all different price points. This particular Orion is a limited edition model released exclusively in Korea back in 2016. When I was looking for my first nice IEM last year, it was recommended as an excellent option within my budget, and while I ended up throwing away any notion of a budget as I went for the Andromeda instead... I recently found these used locally for much cheaper than the 499,000KRW (~$450) price tag and decided to give them a chance.
The Orion shares the same angular shell as the other non-Comet Campfire Audio BA IEMs, which I am personally a fan of aesthetically. Fit can be a bit hit-or-miss, as the sharp edges can be uncomfortable for those with smaller ears. As this limited edition version was produced before the Orion CK, it is more prone to paint chipping around the edges. (The previous owner had carefully taped over the edges to protect the shells, and because of this, these are in better condition than most others I've seen.) This Orion also came with the older Tinsel cable, as well as assorted silicone/Comply tips. In my opinion, the Litz cable is better built than the Tinsel, with a sleeker profile around the 3.5mm plug. Overall, however, I don't have any complaints with the build, and the included canvas case is excellent. (I may even prefer it over the leather one for everyday use, as it seems less prone to scratching.)
In my earlier Andromeda review, I described the Orion as nice, but not exceptional. For the most part, I stand by my earlier impressions.
Bass extension is okay, but for the most part, I felt that it was just... there. It's clean and fast, but somewhat anemic. While all unfair comparisons, compared to the other IEMs I was listening to and auditioning in stores at the time (e.g. CA Andromeda/Polaris, Hyla CE-5, Empire Ears Bravado), the Orion simply lacks impact on the lower end.
The mids are where the Orion shines most. Vocals, both male and female, are excellent and sound natural, and instruments are detailed as well. The soundstage was noticeably smaller than the Andromeda's, but it did not feel particular small or large - pretty average for an IEM.
The Orion came across as slightly bright, but more due to an upper midrange emphasis than excessive highs. Treble extension is not particularly great, and overall, it is pretty polite and never sibilant.
As an aside, the Orion is both source and tip-dependent. When connected to my iPhone 6s Plus, there is a slight hissing in the background, which is usually unnoticeable when listening to music but can occasionally be distracting. There are no such issues when connected to the iFi Nano iDSD Black Label, though I believe a simpler solution like the iEMatch would suffice as well. With regards to tip rolling, after trying some CA silicone tips and some others (Final E-type, SymbioW), I felt that the wide-bore Azla Sedna tips were best, as they provided the best overall fit without negatively affecting the sound.
With the release of the <$200 Comet, enthusiasm for the more expensive, yet also single-BA, Orion seems to have cooled significantly. Indeed, I think the Orion's long time in the spotlight is coming to an end, and at the full $350 retail price (or the $450 in Korea!), it faces stiff competition from other IEMs, including Campfire Audio's own Polaris or Jupiter when found as B-stock or on Massdrop. However, at the current used prices ranging from ~$175-225, the Orion is a compelling IEM, especially for buyers looking for brilliantly executed vocals. It does not achieve the same resolution of the Andromeda or the excitement of the Vega, and bassheads in particular need not apply, but the Orion shows that quantity is not everything by performing admirably for a single balanced armature IEM.