To give praises to this IEM, it features the best sound I’be heard to this day. I don’t exaggerate when I say that I adore how extensive the spectrum of sounds that can be reproduced are. That however, is what makes this review so disappointing. They don’t last, at least to full capability. I’ve bought it twice, after initially hearing about it throughout the internet when looking for a pair of replacement headphones. The first time, things were great for a while. Then later on, about a month and some change after, the left side of the pair started to diminish in strength. It was very apparent since like I said previously, when it works, you can really hear every low and high. The sound was lopsided, favoring the right one, requiring me to EQ my headphone output ratio to balance it again. This is at overall lower volume now but equal again. So I questioned it, but figured it could be a defective product. Some time later, trying to test if it was just a fluke, I repurchased it. Unfortunately, the same cycle happened. It sounded great in the beginning. It continued to for a few weeks while I was being very careful with it, and then the left side faded away again. I write this, sadly, not because I’d like to but because it is a potential experience of someone else that I’d like to prevent. To be clear, this is my experience and probably not indicative of most others’, but it is a thing. For potential buyers, expect great quality, but be wary of build quality. It’s also a shame because I love the design overall and think it looks well-crafted/engineered but that hasn’t been my experience overall, sadly.