I will say that the one HUGE downside to the iBasso DX90 is that they offer no DAC USB driver support for Windows with x64. This was a major dealbreaker, cause they stopped updating for awhile too, even though it was promised. Otherwise, the sound is clear.
That's odd. Why isn't this mentioned anywhere on the Amazon listing? You'd think it would be front page news if this thing doesn't work with x64 Windows. I see one review that says it doesn't have signed drivers and so doesn't work well with Windows 8, but nothing regarding lack of support for x64 systems.
He's wrong. It does work, but requires a bit of effort. I'm using it right now.
There's a 0.5 second delay though so if you plan on watching movies with it then you're out of luck.
I imagine it would be pretty straight forward for Massdrop to do a group buy for the DX90 since we've seen a few DX50 drops. Let's make this happen please!