I bought the 52 a few days back, primarily because I wanted SACD & DVD-A playback and to 'match' my SC-25. Interestingly, I've never gotten the PQLS function to work on my receiver. Not with my 23FD player, nor with the 52FD. I've done firmware updates, cable changes, every menu setting combo possible and still nada. RB CDs still never light the indicators up. Honestly, I really doubt PCM with PQLS offers anything tangible over bitstream anyway, so I think I'm giving up on the whole PQLS schtick.
I haven't had any network issues with the 52FD and it seems to bitstream my multi channel HD audio disks just fine. I do find the remote control field pretty narrow.
Still, I am considering just biting the bullet and going Oppo. Since PQLS doesn't function for me, there's little incentive to keeping the Pio beyond matching logos. At least the Oppo adds HDCD decoding, multi channel analog outs (should I ever want to play with them), (likely) better firmware support, overall better build quality, and more features and ports.