Paired it with the ifi Zen Stack. It has a neutral sound signature, great instrument separation and natural vocals, at least to my ears. The added impedance adapter is a great addition if you like some bass. I use the XBass + 3D feature on my ifi Zen Can, believe me it completely changes the IEM's character. There's more depth, mids are already pretty good but the lows, super punchy. None of the frequencies are overpowering one another, no loss of details even after adding those ifi colors. So these are the positives I have for it so far.
Now moving on to the negatives. The only downside it has is the fat nozzle. Quite uncomfortable at first, even with the smallest included silicon tips, but I got used to it after a day of use. I cannot use it for long listening sessions as it is causing ear fatigue. This alone is enough to destroy the whole listening experience. But I'll still recommend it if the nozzle size isn't an issue for you. So it'd be best if you keep that in mind before making any purchase decision.
Overall, I can blindly say, even after it being my first time experiencing IEMs, that this is the best pair of IEMs anyone could ever own. I definitely recommend. I've seen IEMs that cost over thousands of dollars, never owned any of them, but I don't think they are as good as they cost.
The undefeated wireless headset champ is in my hands. Now these are a pair of closed-back headsets and EVEN then they do a really good job at handling the soundstage which is somewhat near an average open back headphone. The pair comes with a detachable boom mic which is preferable for stationary gaming although I found the built-in one to the job better. The battery stands out at a WHOOPING 80 HOURS. It has multiple connectivity where wired are usb-c and aux and wireless being 2.4ghz and bluetooth where 2.4ghz is definitely better in terms of latency. The audio this pair produces is PHENOMENAL I've been steadily using SHP9500S as my daily drivers but these have become my go to pair, for probably forever at this point. My only issue with this headset was the weigh and obviously closed back, but it comes with something called Side-tone which I'm not entirely familiar with but essentially lets you hear the outside world free of latency.
The Koss KSC75 basically destroys everything else in its price range, there is simply no comparison, the frequency response, soundstage, imaging - both subjectively and technically this pair is just amazing. After using this for a few minutes my first thought was why did I not try this out before? I have lots of amazing headphones but I keep using this, its also really comfortable and very appropriate for travel and office use. I'll surely buy another pair for my wife.