As people have mentioned a great sounding system relies on system synergy.
I have heard Mac source and amplification sound uninspiring and even atrocious paired with GoldenEar and Sonus Faber speakers.
I have also heard it sound about as good as sound can get with Magico speakers. Also really nice with B&W diamond series speakers. A to die for system with their recent cook top hybrid integrated amps and Klipsch heritage, especially the Fortes.
Also their amplifiers can sound better when matched with non Mac preamps.
Again, best of the best when matched up correctly- and they eliminate something that many reasonably priced solid state amplifiers struggle with- grain and sibilance. The Macs have zero of either.