Well... when I write little here it is because I am enjoying the music.
I've had the EA Fusion 1 with the Impact for about 10 days, and everything is perfection. If Code 23 had left me completely satisfied where I wanted, Fusion 1 has taken me to levels that I didn't know I wanted. Is it a drastic change? No, they are small details, but it is perfection in everything. Everything sounds clear, with good separation, good soundstage... I can't find any flaws in the tone or any note or frequency range that goes out of place. The problem is that after months exclusively with the Impact as IEM, I now put on any other, and since there are many instruments involved, they sound dirty to me, compared to the Impact with the Fusion 1. Is it worth the investment? probably not. The return on investment curve is increasingly vertical, for small improvements you have to invest much more. For me it has been worth it, although now I have run out of funds for other interesting IEMs. The Impact now is like going to dinner at the best restaurant in the city dressed in a tailcoat, but maybe sometimes I'd like to eat a hamburger dressed in sports clothes.