[cthalupa]

At the very least, Schiit seems to be pretty upfront that it probably doesn't help with audio quality in most cases:

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  Sonic benefits? That’s a lot of hoo-ha!

  You’re right. There’s no reason this should make any system sound better. 
  Although we can measure the difference in USB power supply noise, it really 
  shouldn’t matter. Despite this, some listeners have said that there are sonic 
  benefits from using Wyrd. Us, we remain Swiss on the matter—we don’t do the 
  hard sell by promising sonic nirvana.

  Are you saying I need to get this thing if I have a USB DAC?

  Nope, not at all. Most USB DACs work just fine when running on computer power, 
  without any hitches, glitches, or strange noises. However, if you have USB power 
  problems, this is a great way to eliminate them. Especially if it’s a USB-powered 
  DAC.

  Well, I could just buy a $20 powered hub if I’m having USB port power 
  management problems, right?

  Yep you can, and yep, that would solve that problem.

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There's plenty of snake oil to go around in the audiophile community, but Schiit has always seemed to be especially forthright about what their products can and can't do.

(Disclaimer: I own a fair amount of Schiit gear and am a very satisfied customer, so I'm definitely biased positively towards the company)