As the resident Archos fanboy on the board, I have to chime in and say that the Archos does this and more. They give you mass storage device AND syncing/music management through Windows Media Player. AND they give you two options on the player its self by letting you browse in soup mode or simply browse the directory tree on the player.

Personally, I like having total control over the file structure of my music. The reason I don't like music management software and soup modes is that they are completely unforgiving when it comes to tag information. Mistakes and incomplete information become an issue, and I can't stand how compilation albums are treated. I don't want to go into my Artist category and, just because I have a few soundtracks, suddenly I have twice the artists I used to, making it harder to scroll through to the one I want. Just because I like the Garden State soundtrack doesn't mean I want Bonnie Somerville taking up equal importance with Blind Melon and AC/DC.

Sorry, went off on a rant at the end there...