So we don't pollute other thread, I'm starting up a thread to discuss the Audiophilleo products here.
I recently bought the Audiophilleo 1 and, while it is almost double the cost of the 2, the gadget nut in me wanted to play with the various features. Regardless, I intended it as an "end game" device, that I would never consider upgrading from. Their full disclosure about how they obtained the measurements and invitation from people to duplicate them gave me some confidence that it should be a good product.
Early impressions, compared to the Audio-gd Digital Interface is that is an improvement with my Audio-gd Reference 1, resulting in more clarity and less "glare". Whereas I preferred the Parasound DAC1600HD for its natural presentation over the Reference 1 before, the Audiophilleo has, so far, given the Ref 1 a leg up over the Parasound, though I need to have another go with it connected to the Parasound instead, though a brief listen didn't have me feeling it was as effective on it as it is with the Ref 1. I suspect this is more Kingwa having been on the long road to perfecting the digital input on his DACs and their full capability not having been realised, going by the effect of the upgraded DSP and better converters I've used over time. I am sure there are DACs that this converter wouldn't be useful with, such as the Cambridge Azur 840c I used to have, which was unaffected in the slightest (IMO) by whatever source component or connected I used with it.