These are a big disappointment.
Sound quality is fine - people who still believe wireless is systematically inferior to wired just need to audition better wireless gear. These are on par with nice budget iems ($100 to $200) paired with a Radsone ES100. Which is a great achievement!
But the build quality lets it down so bad. I could live with the cheap plastic if that was the only issue. But these are, as
@ejswa51 pointed out, very uncomfortable in the ear - and this is coming from someone with larger ear canals. With Comply tips they are just about bearable but I don’t like foam tips when I work out, they get too dirty. Silicone tips don’t provide enough of a buffer, so the hard plastic rubs and hurts. Even with hybrid Symbio tips.
The real bummer is the cable. The length is alright for me, but it’s so stiff! I thought the cloth wrapping would prevent it from snagging on a sweaty neck. It does, but that’s the only good thing about it. The stiffness makes the iems almost unusable. Even with the cable cinch. Truly catastrophic.
The EQ modes are a joke, turning these into progressively worse iems all the way down to a $10 pair from the 90s. They muddy things up no end, it’s baffling. One mode, that pushes the higher frequencies, can bring clarity to clouded masterings, or on occasion bring a fun touch to female voices. In the end I never use them, and if you’re reading this here chances are neither will you.
Lastly, while LDAC and aptX HD support are a plus, you need higher-fidelity HP than these for it to really make sense. AptX is mostly enough even for Tidal Hi-fi. Beyond that, well... I once did detect a slight difference in the treble on percussion-heavy music between aptX HD and LDAC, but nothing meaningful.
If anyone is considering these: get the Nuforce Be6i. AptX and AAC support, imperceptibly less fidelity but still very capable, with a smart tuning better adapted to workout or outdoors listening, much better build, and magnetic ear pieces that make it easier to carry when out of ears. Often available for a song on M***drop. Alternately, if you’re looking for the highest sound quality in wireless iems around this price, try out Meters’ M-Ears.