I really like the Balancing Act (EML Mesh 300b and TSRP) with the X. I've used Liquid Fire, Soloist, Grace M902. I expected the Balancing Act to be better for me. I will have an Apex Teton from the loaner program very soon.
I've now had my X for 12 days and I can hear a good improvement from burn-in. I also ditched the stock balanced cable and using the Q cable from my 2.2 - makes a good difference in dynamics and things seem livelier.