Yes, I saw that and the comparison to the Stax. However, still not sure what to think. I've read statements like "it plays like it costs 10 times its price or more" enough times to become jaded of hyperbolic language in audiophilia, but I know it's not that uncommon to run planar headphones that way. I've never seen anyone try it with such a budget offering, though. If the claim is legit, the value proposition seems kinda absurd for someone who already owns such amps.
So I just you to tell it straight, realistically, does it actually scale that much? If you had to rank technical ability on a scale (F to S or 1 to 7, whichever way you like), where would you put the HE400SE amped by HP amps and amped by speaker amps in relation to other headphones you've heard?