I've just picked up my new Ateca, and as a musician had the SEAT Sound pack added as an option. I must say I'm a bit disappointed - the bigger centre speaker on the dash seems to sum left and right audio channels into what is effectively a mono mix, and the graphic equalizer only being 5 bands really doesn't give me enough control to bring rock and pop tracks to 'life' and still leaves them feeling 'boxy' with too much mid. The speakers don't sound anything special either.
I've not moved from anything fancy - just a Pioneer SPH-DA120 CarPlay unit in a Citroen Berlingo with factory fitted speakers, but the fact that head-unit has a great EQ option (10 frequencies I think) I can really customize it and bring some sparkle and punch to my music. It also has several EQ presets accessible at the touch of a button and the option to save two custom ones.
The SEAT media centre could at the least do with more EQ options, and the option to presave different EQ settings for different sources (eg one for USB, one for radio etc..)- especially when the people ordering the Sound pack are likely to be discerning listeners.