Amazing! What files work best on it?

I'm thinking of picking up the AGPtek H3, which would be my first DAP outside of an iPhone/iPod. Has anyone else been able to try it and would recommend it?

Hey all! I'm a filmmaker, but otherwise I'm completely new to this world. I love music, so I don't see why I shouldn't try to enjoy it more. Admittedly I don't know where to start. My headphones are very mediocre to you guys, I'm sure (Panasonic RP-HTX7), and I'm considering starting with a...