I've just installed Triode's latest plugin, http://forums.slimdevices.com/showth...ff-screensaver , and it works from a screen off perspective.
Whether it improves sound quality is another matter, but is certainly doesn't make sound quality any worse.
Truth be told it's not night and day, and I can't be bothered doing A/B tests and retests to hear if there actually is an improvement.
The lack of display on the screen may well provide less of a distraction, and so allow the mind to concentrate better.
Anyway, give it a go and let us know what you think