Okay some very quick impressions here granted I have only listened to them for about half a day. First half was with them not properly sealed and I am still learning how to properly insert them so it seals perfectly
These are probably the most neutral (in terms of warmth and coolness) and balanced (mids, bass, highs) IEMs I have heard.
This is my first pair of customs so I really didn't know what to expect since I have only listen to high end universals. I thought I was going to be splattered with microdetails or some "magical" sound but instead, these are extremely realistic sounding and nothing really sticks out. Ambiance, resolution, transparency, soundstage, and imaging all appear in a natural presentation as they should sound like in real life. Unlike some universals where clarity and details are a result of frequency bumps, these are extremely flat to my ears with no discerning spikes.
I am listening to these strictly with the switches off as there are 3 more different sounds. While the switches only affect certain range of frequency responses, they also change the overall warmths, tonality, and positioning resulting in different sound signature.
The fit and isolation is insane. As some of you guys have noticed the sound tubes are placed a little strangely. That is because I have weird canal bends. The fit is a little bit past the first bend in my ear canal which explains the positioning of the sound tubes. They fit extremely tight and the isolation is INSANE. I can confidently say they isolate almost twice as good as my Etys with shure olive tips on, which had more or less the same insertion depth. These are the first pair of phones where I can listen to the same volume indoor and outdoors due to the such high noise attenuation. If the Etys measures 43db, these are at least 43+ in my ears. I have feeling it's due to the combination of acrylic shell and silicone filings.
I will post a detailed review in the next few weeks after more listening on all 4 options.