There are many comments about this over at avsforum under the blue-ray section...
I had a Sony BDP S300, the BD quality was good but the OPPO has adjustments that the first gen Sonys and others do not have via the Anchor Bay chip and by turning on function and adjustments for the first time.
I you have a newer Sony Blu Ray I dont think its worth upgrading for the blu ray by itself.
I have several decks, and the 2 ch on this is better for sure....
The Sony BDP 300 I has was extremely Slooooooooowwwwww, painfully.
The Oppo is FAST, almost like a STD Dvd deck.
I prefer the 2 ch audio analog output vs the hdmi output...after many, many hours of switching back and forth.
What makes this player so nice is that it decodes and bitstreams all the codecs...Sony and the rest have always trailed in this area...Oppo delivered and even added
SACD, and DVD audio.