My issue is that quite a few compromises have to be made to build such a small and powerful DAC/Headphone amplifier, which are sadly pretty obvious in the case of the Geek Out.
You would likely get better performance from a compact desktop solution for less, or little more, than the price of the Geek Out +iUSBPower. It would also be a less messy solution.
Audio-GD 11.32 comes to mind but there is plenty of choice those days.
But if you are happy with your set-up then...