Fedex delivered the BDP-S550 Saturday from Sony Style. I connected it to a Denon AVR-1909 via HDMI, and do the decoding at the receiver. The blue "HD AUDIO" light on the AVR-1909 came on when watching DTS-HD MA and Dolby TrueHD content. I watched Pan's Labyrinth in DTS-HD MA, The Godfather in Dolby TrueHD, and Casino Royale in PCM 5.1. The audio was outstanding, even limited by my 5.1 surround configuration. I didn't hear any popping in Pan's Labyrinth as described in other posts.
Power on and loading time was very fast, especially compared to the BDP-S300, which seemed to take a lifetime.
One thing I don't cared for is the player doesn't always start playing the disc when inserted. I have to sometimes select BD-ROM from the "Home" screen. Anyone know a reason, or better, a fix for this?
The other thing I don't care for, though minor, is the info screen doesn't display total running. It displays a time bar with the current position, but not the total time. Otherwise, the layout of the information is greatly improved over the BDP-S300.
Infinity TSS-4000 Center, 4 TSS-1100 Satelites, Jamo Subwoofer.