Have the A5 driven by ARC Reference preamp and Pass class A mono's. Had multiple sets of Wilson's prior.
The A5 is a very good speaker for the money (still expensive). In my room, careful positioning leads to amazingly large stage and ample but tuneful bass. If anything, they can have too much bass, not too little. Detail and dynamics are top notch. Super clean and low distortion sound, natural tonal balance.
It's all about how the speaker interacts with the room and associated equipment, along with proper placement.
M2 is a smaller speaker, and too expensive for my taste so not even an option. A5 costs half of a discounted M2.
I view the A5 as a poor man's M6. Bet the A5 is blowing the doors off sales wise most of Magico's mid ranged products. For me it's either the A5, M6 or nothing else in the Magico line up.
Just IMO, naturally.