Well, after long last, I've finished my review of the Oppo HA-2 for Headfonia. It's a great DAC/amp that has the following quirks:

- AK100-level output noise
- confusing in/out for DAC users on the run

But those are mere niggles. The HA-2 is an amazing piece of portable equipment with a great DAC. It should challenge the status quo on both ends of the price spectrum. It should leave an iPhone-like mark on the industry.