Fidue A31s

A little about myself: I find the most important factors to be detail, fit and build. I would classify myself as one who cares about the aspects that would appeal to the general consumers too. Personally I favor a flat sound signature and as naturally sounding as possible. Apologies my hearing ain't godly so I will not comment on bass/treble extension. *I will not attach photos or specs since they can be googled*

Package/Accessories (4/5) : Quite good for this price range. The bi-flange provides decent isolation.

Sound (1/5) : The sound is totally irrelevant in the budget-fi world nowadays. The bass is very much boosted and is rather muddy and congested at the same time. The mids and treble is just overwhelmed by the bass. The sound might be acceptable for bassheads.

Body (2.5/5) : The body of the IEM feels quite strong, however the nozzle design makes it feel rather fragile. The cable itself is quite bad in terms of ergonomics but fairs ok at microphonics. Despite the body itself being quite comfortable, the cable makes it uncomfortable. I appreciate the microphone with a single button though.

Overall (2/5) : This IEM is only worth if one really needs to have a small earpiece body.

Good headphones for music with electric guitars. It sounds like a live combo. The bass and low mids very good, treble slightly pinched. Very comfortable to sit in the ears due to the small size. Cable aging rapidly and becomes rigid, his rings are not victimized.
 
Here is my video review in Russian:

Boomy loose bass. Warm overall - mids and treble are decent but a bit plastic/muffled sounding. Unfortunately has tendency for sibilance/rasping in parts of treble/detail freq. unchanged after about 50 hrs of use, which ruins an otherwise solid pair for me. *
 
The A31s can be worn straight down and over ear, and are very compact and comfortable for my relatively shallow ears- the dual-flange tip often pictured with them has the decent isolation, but only comes in medium size (also includes small and large single flanges, a clip and pair of wire guides). Cable has minor noise avoidable with the shirt clip, a nice coating, and is very (maybe a little too) light , but annoyingly also remembers kinks.
 
Overall, they are difficult to recommend due to sometimes piercing highs I experienced, which is a bit of a shame because they otherwise offer big bass, with ok all-around sound and utility for the price.
 
**edit* Did additional burn-in (~30 hrs), didn't seem to affect. Went through the tips again and noticed with the single flange those bits of sound are somewhat less piercing, I guess due to positioning in my ear, though I prefer the overall sound and isolation with the biflange tips- still hesitant to recommend, but bumped up to 3 stars from 2.5- YMMV.