hi, albeit belatedly let me share my experience.
I have moved from a NAIM streamer (NDX +XPS5 power supply) to MSB (first Discreet and now a "full" Premier with PowerBase + Fempto clock, -these were optional when i got it but apparently now are standard-).
Although I do expect the 2nd power base to make a difference I honestly think there exists a house sound signature between the two brands, with NAIM pushing the dynamics/PRAT attributes whilst MSB sounding (to my hours) much more "finessed" (no lack of detail, no lack of dynamics but at the same time no forceful push of the dynamics envelope either)
That being said and FWIW: I have recently experimented with direct vs going via a preamp and unless you pair with MSB's own power amp (which has a low impedance option matching the one of the MSB DAC) a preamp definitely increases the dynamics and liveness of the sound