I just bought a "universal" player last weekend, so I'm still tweaking and tuning, but my initials thoughts are...

When playing a DVD-A or DualDisc through "6 Ch Input", they sound amazing...crystal clear. Then I turn off "6 Ch Input" (which then I assume the signal is DD 5.1, coming through the digital Toslink), it sounds like complete crap. My guess it's because DD 5.1 is compressed.

I liked that fact that the 2 DualDiscs I purchased were only a couple of bucks more expensive than the CD only version. I did by Metallica's "Black Album" on DVD-A, but it cost me over $30 CDN!!