I really like, more than I thought I’d would
I’ve used it with the AM3 module and mostly using the balanced output,
It sounds pretty good, clear and neutral and no hearable background noise with one exception.
I’ve used Shure SE535, Hifiman HE560, Audeze LCD2 as well as Sennheiser HD 600 & HD 700. It works well with all of them execpt the HD 600. Given the impedance at 300 Ohm of the HD 600, I think it was to be expected.
The exception with background noise is related to using Wifi and buffering. Occasionally with Tidal, there can be some short noise just before a song begins to play. Although it can only be heard with my Shure S535s, which are infamous for picking up any noise. Otherwise it is dead quiet on the noise even with the SE535s.
Also use it in the car, where I can either use Bluetooth and then control it from the steering wheel and Navi/Entertainment, which is convient, or through Aux in. The latter sounds a little bit better but is not so practical. In the car, I also have an USB disk and my iPhone hooked up through USB. The X7 sounds best but the others are easier to use.
Finally, I’ve tried as a DAC and DAP in my office but Roon from my Mac Pro to my desktop DACs sounds better, at least as long as listening through speakers. Then again, the desktop DACs costs a lot more than the X7 so not that surprising.
To sum up, I think it’s pretty darn good, especially taking the price into consideration.
With headphones, it sounds great and offers a lot of functionality.
As a bonus it works well in a car and combined with a docking station, it is a decent desktop amp and player.