This is a fine audio interface for the price.
The preamps sounds well balanced, without alot of character - which is for better or for worse, and it generally sounds flat compared to higher grade audio interfaces.
Needless to say, its a great interface for the price with alot of features, which all can be controlled from their "Focusrite Controlpanel", very neat.
The air function is not just an EQ, but actual circuitry that is adding harmonics in the top end, which is adding a nice bit of detail that is needed sometimes.