Disclaimer: I received this unit for free in exchange for my honest opinions. Also, the $50 bracket is crazy competitive rn, and I've been out of the loop. Can't say for certain that this could measure up to the new heavy hitters
Build: Small plastic body with carbon fiber patterned faceplate. Very light weight as a result. Hass that little wedge to better cling to your outer ear but nothing too crazy that would hurt in the long term. Medium-sized nozzle both in diameter and length; don't see it causing any issue for most people.
Comfort: Great thanks to the above.
Accessories: S/M/L silicone tips, cable tie, and a pair of Tin's foam tips. Unlike some other Tin offerings, the box can't really double as a storage case.
Sound Signature: bassy implemented in such a way that is not far from a mild V much, so there are the usual compromises but not as much. Naturally, it won't be super bassy as well.
Bass: It is quite bassy. Sub-bass focused bass boost with a gradual slope up the mid-bass, so you get a mostly clean bass without missing that mid-bass. Average leading impact and decaying body not specializing towards one end too much. It is a mostly clean bass for the most, but there is quite the quantity of it as well so there are some drawbacks.
Mids: Speaking of the devil, the lower mids are undoubtedly shafted by the bass quantity. Not the worse I've heard nor a bad lower mids but pushed back nonetheless. Upper mids is just north of neutral with a little boost. It mostly acts as a counterbalance to the bass though, and even for someone 4k sensitive, it doesn't bother be as much. Female vocals doesn't suffer so much but is still 2nd to the bass.
Treble: Dark. It dips down after the gain. However, it does extends quite well but normally it's hard to tell cuz bass. Nothing much else to say, as it's hard to pick out the treble separately. Side note: no worries about sibilance as there's jack up here
Sound Stage: The bass seem to have this room echo effect that inflates the sense of space, kinda similar to the EJ07M KL although not as good. Overall, it's tad larger than the average IEM. Vocals still kinda sound in your face though, prob because of the upper-mids boost and recessed treble. I'm also guessing that the dark treble also contributes to a sense of space.
Detail / Separation: It's alright for this kind of tuning and price I suppose, but it's def not competitive. Just the bassy tuning alone kills a lot of any clarity you could get. I keep turning up the volume to hear the lower mids and treble I'm used to hearing with more neutral/balanced sets to no avail. The bass and upper mids just come out to bite me. You won't get the same kind of separation and detail as more reserved tuning, but it's also not atrocious. At least not something I could fault at this price. Obviously, it's for a different crowd than those craving details and that's fine. Not sure how well it measures up to the benchmark sets of this range tho.
Conclusion: It's a $50 bassy set with notable but not extreme caveats to the rest of the frequencies. Nothing too crazy. I personally don't like this kind of tuning much. It doesn't compromise the other freq. to the same extent as consumer approaches to bassy tuning, but it's a compromise nonetheless. Personally, I prefer bass-boosted neutral.