I have heard both the Audiomeca and the Audio Aero, but not their newest versions, although it is my understanding that neither the Mephisto IIx nor the Capitole Mk II break any new ground in sound, although they may sound slightly different from the earlier versions. In my listening, the Audiomeca was better. Exceptional detail, holographic midrange, tremendous air around instruments, excellent mid and high frequency presentation. No brightness or harshness, but exceptional detail with liquid midrange, clarity and transparence throughout. The Capitole sounded like a good player to me, no obvious flaws, but in the couple of times that I heard it, it didn't strike me with the exceptional qualities which I heard in the Audiomeca. The Audiomeca unfortunately doesn't have killer dynamics or killer deep bass. In my opinion, these are the only things it lacks. The Capitole has never tripped my trigger, perhaps due to less than excellent recordings or room conditions or associated equipment.