Well, I put in a PorterPort a week ago and the differance was very noticable. At first it was a little edgee. After two days of burn in it smoothed out and added depth and focus to my Oppo BDP-83. My Virtue Two is on battery power and that was a huge upgrade. Everyone may not here the differance as I did. But since I put wall treatments in my listening room I've been able to hear subtle differances. Hope this helps. zman
