I heard the Luxman at an audio show and did not care for the sound- very dry.
I had a very long listening session with the Mac 1.25 KWs (you are talking about the 1200 watt mono blocks, right?, these are serious amplifiers !). they were driving huge Magico speakers and the sound was not "word of mouth" McIntosh. The sound was exceptionally transparent and clear with no haze or hesitation. It was instantaneously dynamic and live and powerful enough to fill a medium sized theater.
For a large room and difficult to drive speakers these are my best sounding, final word amplifiers- ever. If you have the cash you won't be disapointed.