They arrived 6 hours ago and I have to admit I was impressed. I prefer them to the OSHIDA E20 which in turn preferred them to the Zero Red which I found boring and at times mediocre.
I'd like to start by saying that it's a great "all-rounder" IEM but I'm not crazy about the Harman curve (I prefer less gain in the 3000Hz area and more treble up to at least 15,000 Hz), which is why, for example, I still prefer my IE200s, but leaving aside that's if Harman tuning is your favorite, once you have the Zero 2 in your hand you can very well stop looking for something else in the future.
After the experience with Zero Red I approached Zero 2 with some reservations and instead I was pleasantly surprised: it doesn't get congested with complex tracks (hey Zero Red!) and the entire 20Hz-1000Hz area is much more coherent than Zero Red which has an anemic midrange and then has this subwoofer that works badly and disconnected from the rest (it's the main reason why I prefer the Aoshida E20, besides the lack of air) and therefore you don't have that annoying hole around 150Hz.
With Zero Red I felt that everything was coming from the center of the head and with Zero 2 this doesn't happen, fortunately. The construction is fantastic and aesthetically I find them beautiful (they look better in person).
They are very comfortable and you can forget about the fit issues of Zero Red. Ok, it's plastic and doesn't look premium, but who cares!
If they had a little more air, were made of steel, had a more premium looking cable (like the big heavy ones that I personally hate) and were priced at €300, they could be sold with little difficulty.
I apologize if I sound mean towards Zero Red, but in my opinion it arrived on the market at least 4 years late to be a novelty and, to my ears, it didn't even hold a candle to my €35 Cadenza and i'll probably send one to Amir to have him measured...