So the Viliv P1, which we were so in love with, has let us down. According to CNET, the UI is atrocious, the battery life sucks wind, and the file formats it plays are for early adopters only. Not surprising, but kind of disappointing.
Overall, it looks like a good product that just needs a HI expert's touch. The UI was clearly designed by someone on the fly and the resulting mess ruins the experience.
Yukyung Technologies Viliv P1 (30GB, red) [CNET.com]