Been using Comet for the last 2 weeks. Just wanna share some experiences:
1. Out of the box, Comet does not work with my HTC10. Problem solved after I download an app called "Lesser Audio switch", which bypass the default headphone recognition software of HTC10 and route audio output either towards headphone port/speaker. Works flawlessly.
2. All un-boxing video of Comet I've seen show that Comet comes with Spin-fit tips. Surprisingly, my unit comes with Final type-E tips. I tried wearing Comet with the bundled Final tips as well as my own Spin-fit CP100s. I find that with the Finals, Comet stick out of my ears less than with the Spin-fits. Result - better comfort, more secure fit. No significant sonic difference though.
3. Comet's rated nominal impedance is higher that 40 ohms, yet it's surprisingly sensitive to source's output impedance. General rule - higher OI = brighter sound, vice versa. Out of my Chord Mojo, which has less than 1 ohm OI, Comet sounds gentle, forgiving, sibilance-free, slightly bassy (very slight). In contrast, out of my Lenovo laptop, which gotta has an OI of >10 ohms, Comet sounds harsh, sterile, bass less, even more sibilant than my un-modded HD800. My favorite source for Comet is my HTC10 - tonal balance stuck between Mojo & Lenovo with a slight bright tilt. Disclaimer: I am a treble-head.
4. Comet is not a technically-competent pair of IEMs. It does not "scale up" (in terms of detail-retrieval, spatial-cues depiction, bass pitch-differentiation, timbre-differentiation, dynamic contrast......etc.) at all. It's part of the reason why I prefer driving it directly off a phone over driving it off Mojo.
5. Without doubt the most ergonomically designed IEM among all Campfire IEMs (I tried em all). I only have 2 complains: a.) cable is slightly (just ever so slightly) too heavy for an IEM that is designed to be wear cable-down, due to the added weight of the attached mic-remote. / b.) Shape of the earphone housings makes wearing Comet cable-up kind of troublesome - finding the right insertion angle is somewhat time-consuming (well, still a matter of couple seconds...).
6. Build-quality wise......well, it's made by Campfire Audio - nothing else need to be said......you know something is genuinely a piece of fine art the very first moment you encounter it.
Conclusion: Extremely impressive in terms of design/aesthetic/build-quality/accessories. Moderately impressive in terms of "fidelity"...same amount of money gets you a pair of Brainwavz B400s, which actually does "scale up" as you improve the quality of front-end, unlike Comet. I am still impressed by Comet's sound quality despite it's lack of technicality, as it got an easy-going, pleasing sonic character that plays well with vast majority of modern music genres (assuming low-ish source's OI). Also, I think that ultimate resolution isn't really that matter for obtaining musical enjoyment......for me at least.