I tested out the bdp 450 a couple times this past month. I compared it with a sony 350. Pq for me looks excellent, but I tweaked the settings on the player. I haven't tried the out of the box settings yet. The great pq is more noticeable when I pause it. During playback you might not notice it that much but on some movies that I watched recently like Batman (keaton) and Jurrasic park 3, I went wow!! Ganda man.
I have to test it out more (compare also to ps3) bec. baka sa mind ko lang yun wow ko hehehe..
For dvd, I think it has no match vs my oppo 980 and my toshiba a35. I have to check again. The oppo 980 is one hell of a player.