I upgraded my M1 se to and series 2 and have about 100 hours on it so far. First impressions compared to M1 se - sound stage is deeper, increase in detail maybe just darker between instruments and bass is not as pronounced. All in all very happy with the upgrade. It will be interesting what changes next few hundred hours.
By the way; Bricasti is a great company to work with. Build quality is excellent and network (streamer / renderer) card is excellent.
I moved from an PS Audio and the Bricasti added “life” to the music.