I have used both the Bricasti M5 and the iFi Zen Stream with LPS and optical cable with FMC’s on my BIA Glass Dac. The Bricasti is a definite step up but both sound very good. I ungraded my main system Dac to a Lab12 Reference so my BIA Dac is used on my second system with the iFi zen stream. The main concern/issue is the iFi zen stream’s set up is a pain, glitchy and not intuitive. Help support is just worthless. Bricasti M5 is the mirror opposite with no issues. Replacing the Zen is on my future list so I am interested in what becomes of this thread as well.