I realize this is ancient news in 2014 but I recently rediscovered my iAudio7 and am loving it. It sounds remarkably good for a "fun"-signatured DAP and holy mackerel, the battery life is incredible. 50 hours? 60? I don't know but it's great.
The secret, obviously, is the super small and low-res screen. But you know what? Fine by me. It's perfectly adequate and once you get used to the counterintuitive UI, it's pretty easy to manage. In a world with ever-evolving tech, this is the rare case of "they don't make 'em like they used to."
Pros - sound, battery!!!, size, sound control features
Cons - sensor controls, UI
If you need music player only - this one is what you need
Great sound, especially with good headphones. I have Shure and Eyymotic for different kinds of music. I strongly recommeng using FLAC with this player, it provides really great sound quality in this case.