I had Hiato, Hegel 360, Pass int-250, Diablo 300. Currently own Luxman 509x and very happy with that. Plinius is powerful , but not refined, lacks the air and has a glare at highs. Not easy to resell. Pass int-250 is very good but in my system lacked some dynamics in compare with diablo and luxman. Granted I had different speaker when I had pass, so system synergy will be important with pass. Diablo 300 is great - close to live sound, but I had to sell it to finance other projects. Plus shipping diablo can be possible by freight only, since its coming in a wooden box that supported by plastic staples. The hegel 360 ihas a good bass, but build quality is not on the same level as passs, gryphon or luxman. The sound was to analytical for me. The Luxman 509x in spite of its 120w at 8 ohm drives my speakers (canton reference 3k) with ease and good dynamics and airy, refined sound that is not fatigued at any volume.
I firmly believe that power ratings never tell the whole story. Its all about implementation and parts quality that result in refinement and proper current delivery.
Never had Mac so cannot comment.