Atticus' presence has already been felt in terms of imaging and packaging. The adverts are far more lively now, and Atticus' DJing also has a more energetic, attentive quality to it. It's made it pretty obvious that Zigz was exhausted from years of not just being PD, but also MD and being the midday host. Hopefully with Hayley handling APD (effectively MD) duties Atticus won't overwork himself.
Atticus did re-introduce a wider variety of classic rock to the rotation. It's caused some weirdness like Pink Floyd's "Wish You Were Here" seguing into Twenty-One Pilots' "Level of Concern". My taste is eclectic so I don't mind personally but I do wonder how the listeners feel.