https://www.headfonia.com/aurender-flow-im-half-crazy-love/
Whether you feel its worth the $$$ in 2018 is up to you, if I didn't already have a Mojo and some other toys I would have considered this, their streamers are great. This unit is unusual in that you can add an internal M2 SATA drive, not seen any other portable DACs that do that.
nikonf5My bad you are correct its not M2, though as far as being difficult to find a quick google search brings up Samsung drives available from Amazon, B& H etc, so I wouldn't characterize it as difficult to find. I guess they use those in some of the Intel NUCs also.