After a long love and hate battle with XBA-4 I want to say I am glad I kept them. I finally learned how to EQ them and with what amp makes them sound good, what music suits them best.
I love XBA-4 soundstage, instrument seperation. I love the sound of double bass in jazz music, I love the sound of cello in classical music. If they were not as sibilant as they are now they would be one among the best.
Hopefully I can purchase the EX-1000 and get to compare them soon.
I feel I have something special in my hand, I think in about 10 years time we will be looking back on this IEM with great nostalgia.