Great sounding interface, high quality quiet preamps, great headphone amps, smooth sturdy knobs, well built.
Basically all of the important stuff is high quality, I won't go into details about it.
The Focusrite Control Software is great and very flexible.
However the text is tiny and there's no option to resize it.
If you're using a 4K monitor, it's gonna be very hard for you to read it.
I hope they update it in the future.
It's a bit strange you can't control the main outputs through the Focusrite Control software, apparently because the physical volume knob on the interface is a digital encoder and not a potentiometer, but still it feels like they could've solved it with a software update if they wanted to.
I was a bit surprised there's no built in loopback, especially considering the Scarlett range has it.
You can create your own loopback by sending outputs 3-4 to your SPDIF output and connecting that into your SPDIF input.
That of course will disable you 3-4 outputs from any other use, but you can switch between different setups in the Focusrite Control software pretty easily and quickly.
The phone app is also a nice bonus.
Also, the air mode really does sound different than the Scarlett range.
Overall great interface with great performance, despite the few quirks.