No experience with the M3 but I have an M1 and can state that Bricasti is a great company to deal with. They resolved an issue with my M1 incredibly fast and fwiw the M1 is a great DAC.
Bricasti M3
A new Bricasti dac has been released rather recently. The M3. I see just a couple of short reviews. Anyone have any info they could share? Like maybe what makes it around $4000 less then the M1 for starters?