I'm using the usb dongle on left that came with the xduoo xd-05. I also bought one for the zx2, then realized I'd be using the xd-05s dac. While it sounds good that way, I find out of the zx2, analog sounds best. I use that when it want to use big cans amped with zx2, and I also get to use the xd-05s massive bass boost. It's too much for most iems.
I had the exact same cable but I liked this.