Audient iD14 by Mister Gray
Upgrading from a Scarlett 2i2 to the iD14 was a satisfyingly DISTINCT experience. This was an objective improvement in sound quality coming through my monitors. By my perspective, certainly well beyond the $200 price difference.
That said, this is obviously a very small interface sample size. Take that 5 star score accordingly. I'd score it a 4.5 if I could, for the occasional slight audible crackle when changing headphone volume with the encoder.
Ease of Use
Functionally, this thing is a breeze, both the hardware unit and software interface. Disclosure: I don't do anything complex, and haven't used the ADAT input.
The Mac drivers have been sort of confusing, thus the 4 star rating. Sometimes the updates don't want to install to the applications folder. The troubleshooting guide on the Audient site helps get you there. Firmware was difficult to update in the early versions, but Audient seems to have smoothed that process out significantly.
The instrument DI is sweet, and the quick mute and mode functions work for a one man show like myself. I dig the tactile response of the phantom power switches. It's a nice touch (haha). The dbfs meter/volume indicator gets you in the ballpark, but isn't a precision instrument.
I've never had an issue with headphone volume (except the aforementioned crackle).
The non-bypassable preamps bother me if I get sucked into the internet's audio OCD, but stepping back from those threads brings a healthier perspective, and the preamps sound good anyway (by my estimation).
Aesthetically, it's a solid box that adds a little class to my desk.
Bang for Buck
Off the charts. Hydrogen bomb detonation for the buck. It's so good for $300. Highly recommended.