A first few comments.
The outer packaging is quite flimsy and should be improved. Inner packaging is a nice pelican type case. Many many tips are included and quite a few accessories. I will be using RHA tips that are quite similar to the stock silicone tips but a bit more comfortable to me. The stock cable is one of these cheap stock cables. What I don't understand is how they could have downgraded the cable from the SD series! I immediately switched to my crystal cable.
The iem itself has an impressive build, the matte finish is great, the fit is very good for me, as with previous Inear iems.
First impressions is that they sound very good. It tried them with the Lotoo Paw Gold and the Sony WM1Z. No hiss a priori, quite a neutral signature. Nice spacious soundstage, no glaring peak that I heard. Very detailed and revealing. I will not say much more at this stage, good neutral iems take time to really grasp.
I played with the switches, they seem solid and are fairly easy to access. The bass boost is very well implemented, doesn't get too dark or bleed in the mids. Slightly more impact and a bit more subbass as well. The treble boost changes the tonality to slightly more crisp and sharp tones. A bit fatiguing to me, but I do have a hangover today. I surmise I might prefer bass boost or both boosted. Both both switches boosted, you get a more forward and aggressive presentation without having too withdrawn mids.
For the first few days or weeks at least, I will still to the default setting to better grasp, and because it doesn't lack anything to me.