Pros: Awesome build quality, stylish, small, loud, great battery life, OLED display, dual headphone outputs
Cons: Poor EQ
The FiiO E7 is a wonderful device.
It is a combo USB DAC and portable headphone amplifier unit. It has a 1-inch OLED display and a simple but good menu system. The screen is bright and vibrant, and looks very nice.
It has a high-end Wolfson DAC chip, and the audio sounds much cleaner than out of my laptop.
The amp has quite a bit of power behind it: 150mW/channel into 16 ohms. It drives my AKG K240 Studios very well without breaking a sweat. It even has the balls to drive my Pioneer SE-700s to listenable volumes with no distortion. That's extremely impressive; these headphones were designed to be driven from speaker taps.
The only thing about this product I can say is bad is the equalizer. It doesn't have bands, first off: It's only a bass boost. Second, even the 1st boost setting causes heavy distortion, making the whole thing entirely useless. Another thing that's less of a flaw and more of a nit-picky thing, is that you can't <just> charge the unit through a USB port on your computer. If it is plugged in, your computer will send all audio to it even if it is switched off. Not sure why FiiO did this, but they did.
Definitely go for this. FiiO is a great brand. I'm definitely considering some of their other products after this experience.