Pros: plenty of power, sounds great
Cons: I'm really trying to think of something but just can't
I bought this as a package with the FiiO E17 Alpen for $260.00 I feel that i got a great deal for such a wonderfully versatile high quality product.
AUDIO - This has enough power to make my Audiotechnica ATH-M50s, Sennheiser HD 380 Pro's and Hifiman HE-400's sound fantastic. It doesn't add much colouration to the sound of the headphones, it more enhances the particular characteristics of each set. I think this unit has outstanding audio quality for it's price.
EASE OF USE - I mentioned the versatility of the unit. I like that i can run my PC speakers off the line out or pre out and they are muted when my headphones are plugged in which means I can easily use the DAC in my E17 for my whole PC setup easily. To add to this if I want to listen to music on the go i don't really have to sacrifice audio qualit as I can just pop the E17 out of the dock, plug it into my iPhone and use it portably knowing it is fully charged every time since it has been charging the whole time it has been in the dock.
BUILD QUALITY - The build quality of the unit appears to be extremely high, and I mean surprisingly so. Having read reviews of this before buying it i was expecting it to be well made but it exceeded my expectations.
I would not recommend buying this without the E17, I'm sure it would be fine to use without it as a desktop amp (no DAC) but half the beauty of this product is how well it pairs with it's little brother. It's the best way of having 2 amps for different uses without actually having to own 2 separate amps.
Thank You FiiO