I bought the EXPanium this last week, and here's what I can tell you about it:
1. Some people on the web have complained about it not being solidly built, I have found it to be the most solid build of the five or six diskmen that I have owned,(one Aiwa the rest Sony's in the $100 price range)
2. Battery life using Kodak Photolife battery's has been 12-14 hours, better than the claimed 10 hours.
3. Played all bitrates I have including VBR, known rates that I have tried 32, 128 256 192VBR.
4. Recognized and played all MP3's I have given it(burned using CDRWIN DAO).
5. Easy to navigate from folder to folder.
6. Using Grado SR80's IMHO it sounds great. I haven't tried the earbuds that come with it.
7. It is probably a little overpriced, but right now it is the only CD MP3 player out that will play bitrates 32 - 320, went for the extended warrenty at CC for $25 and if it craps out in the next 2 years I get my money back. If I get 2 solid years out of it (and I intend to use it a lot) to me it is worth it.
8. Display can be a little confusing but I am sure I will get used to it.
9. Soon there will be better cheaper players, but life is short so I don't feel like waitng anymore, and for what it is I think this is a very good product.