Pros: Neutral. Multi-function. Solid built.
Cons: Nothing extraordinary or impressive. Just did it job fine.
I've owned E7 before, and had a Centrance DacPort LX. Well, E17 fits the bill to be the value buy (Over here Audio gears are expensive).
Sound Quality: Nothing impressive. Just plainly neutral with slightly rolled off treble. Not as energetic as the previous Dacport LX. Doesn't like to mess with the bass/treble boost functions. As an amp, it's quite powerful. Can drive my T70 (250 Ohm) with ease (my comfortable listening volume is at 45, minimal gain).
Built: Tough as tank, solid. Love the LED, looks classy. Quite bulky.
Features: Lots of features available. Bass/Treble Boost, channel configuration (left right +/- gain), is portable with built-in battery inside. Lots of optional connectivity (coax, usb, aux-in) and also DAC part supports up to 24/96 on USB (well, even the screen will show the playing song's bitrate info).
Value: Considered one of the cheaper and versatile DAC/Amp combo. Great for on-the-go audiophiles.