I bought the original S1D, they are great! But I was hoping for clean and crisp sound from the KZ and while the S1Ds were great they lacked the clean clarity you're looking for in a good pair of KZ in-ears. It is not so. I've seen other not-so-great reviews and want to make sure they know they sound better. I'm assuming it's a hybrid setup versus a dynamic setup in S1D. Who knows? I'm not smart enough to know the technical reasons, but my ear does, and they have that clarity of articulation that the S1D lacks. The S1D's sound sounds more like Bluetooth headphones to me than these, if that makes sense. They roll off that high articulation too much for me, so maybe they have more punch. Maybe it's more your style. But shoot bro for $30 why not buy both and see what you like best. I can't fully speak to the battery life just yet, but I don't expect them to last all day. Again they are $30. But from what I've heard about AirPods, you can get just as good, if not better, sound with these KZ S1s with similar functionality for about 1/8 the price. You will be the judge. All I can say is that like almost every KZ product I've used I can 100% recommend them. If you're a musician who uses headphones and need cleanliness for listening pleasure, get these. If you just want AirPods or a fake and you're looking for a cheaper alternative, skip all alternative social media ads and spend $30 on a pair of these and you'll wake up to quality sound in your ears. Haha woke up. Look at me. be all hips and stuff. Who knew it was in me. CONCLUSION: UNDERSTAND IT.
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