Ugh, this was my first experience with Fiio...not a good start...
The amp "works," I don't know if anything is actually wrong, though I'm not really impressed with the results. To be honest though, I had less hiss straight out of my Sansa Fuze then out of the E5, and the volume of the Fuze was generally louder than the amp, even with the volume turned up. So, I supposed it doesn't actually work, but music plays through it. I feel like the music is slightly more lively, but not by much. I wasn't expecting much out of a $20 amp, but I assumed it wouldn't make the sound worse...
I think I'll just return this...I was looking to try the Fiio E7, but I don't know if I should go with Fiio again. Maybe just bad luck, but still...Perhaps I'll save up for a D2 Boa...