Rockbox is indeed a wonderful thing and I've also used it since my first Archos mp3 player. No original OS can match it for features. I especially like bookmarks, gapless playback, mid-song autoresume, the ability to delete files, and most of all, the ability to browse the actual file system structure. ( I swear I don't understand how people find anything on a normal Ipod)

Unfortunately, I think there are no players still in production which are supported. (though many, Sansa C series in particular, remain in channels and plenty more are available used) Granted, support for new players is ongoing but you can't really expect to use rockbox on newer & widely available hardware.

It would be fantastic if they could make a deal with some hardware vendor to make new players that are actually designed for rockbox.