A few things... (Thanks to Harman Master for the accommodation!)
1. This thing sounds proper flagship material. Sound is beautifully balanced albeit would prefer a slight bump on the lows as this one is too tight despite having a dynamic driver. Using the bass filters is however leaning too much on the darker side.
2. Using the "Reference Tips", it is even more balanced than my Ed8 and the AD100.
3. Slightly leaning on the analytical side rather than visceral side bu just slight. It still breathes air, detail, lush mids, kicks on the lows and imaging is really good for an IEM.
4. Yes, you still know you're listening to an IEM but again, the best for sound quality comparing to all the IEM's I've heard including a ton of headphones I've auditioned.
5. It manages to sound great at least if not excellent on a lot of genres.
6. Changing filter tips really changes the sound a lot like listening with or without amp kind of big.
7. Weight is beautiful and I think they got it perfect. On your palm, you know they are quality stuff but on your ear, they are solid and light.
8. The stock tips are excellent already. Seal is not that great but they stick to your ear.
9. Get an amp with this. The SQ difference is big without an amp. I used the TTVJ Slim to audition. Beautiful pairing.
10. Overall conclusion, they really sound wonderful! Almost close to superlatives of some of the top tier headphones but not having to sacrifice on other aspects.
11. What I will say is this; I think AKG really set out to create the best sounding UIEM they could with all their engineering skills and know-how. They did not hold back on anything and that makes it truly special. Nothing was compromised nor held back. For me, it is a feat to get it sounding this good.
12. Is it worth their asking price of $1,300?? No. Very no. But.. its the best.