I'm not sure why I lucked out but I loaded up Rockbox in about 5 minutes and after creating the internal DB, I have been enjoying the super response software with tons of codecs. My one head scratching moment comes form not being able to get a response from the buttons on the top of the unit. The power button works, but the others do not. Whether this is consistent across many or just a quirk with my unit, the other buttons work so I'm fine.
After researching and discussing with some mainstream audio engineers and producers, from ad hoc DBTs they have conducted, AIFF seemed to out perform any compressed lossless codec. Again, no idea why this would be, particularly if, for instance, the playback software was in "hog mode" and throwing the entire track or album in RAM. There should not be any latency nor any change in sound, and decompressing FLAC or ALAC to some PCM format is trivial more any modern processor. Regardless, my house is squarely in the Apple camp and I hated having to fight with various systems to get FLAC playing properly. Server to PS3 with some transcoding in between, or transcoding to V0 or AAC and connecting a drive directly to the PS3... it was too much work over time, but I kept at it until last week when I tried my luck with an Apple TV. Not a fancy device but cheap and completely useable as a headless device (very important) and no fan (even more important). So the PS3 has taken to the side lines for family streaming and now that I can use AIFF on all my devices, I've begun transcoding and will archive in this format. WAVE should have been equally okay, but tagging is borked.
Anyhow, Rockbox + 801 + AIFF is flawless thus far. Also, my battery life seems to have been extended by 1/3 to 1/2. I'm using the GAME amp and the sound is sublime.