...well, since you asked, sir, I will say as of a certain FedEx delivery yesterday, I no longer own an MSB Reference dac and DD.
It was a very fine set-up and I enjoyed its detailed musicality. There was nothing I didn't like about it, and I like the company too.
That said, for my ears, the Olympus analog output was very close, and very musical. In that case, the MSB dac loses the game here. Even though I owned it already, being able to remove three boxes was a net positive, with no sonic penalty (to me).
I ran the analog output exclusively for the past month, approximately, and had decided to put the MSB up for sale. It sold pretty quick.
This scenario was similar to the process of purchasing the Reference dac when I owned a Chord DAVE (still have it in a second system).
I had the Premiere dac for a three week demo, and I thought, although a different flavor, it was not "better" than the DAVE. A parallel move, of sorts.
So, I demo-ed the Reference dac, which to me was clearly "better" than the Chord dac. I purchased the Reference, and when it arrived to the marketplace, the DD.
I have read and heard that owners of the MSB Cascade love the MSB card workflow and sound, and I do not doubt that at all. The Cascade has new tech and new implementation and knowledge from the SoCal team. And costs a lot more than the Reference did. Makes sense to me that it might sound better in whatever ways folks like to evaluate hifi.
I also recently added the Taiko router, which IMO moved the Olympus analog sound a bit further ahead, although I did not make that head-to-head comparison with the MSB gear. Once I mentally committed to the analog card, I also added a SE module to my WestminsterLab Quest pre, which was fully balanced. That is really excellent, and allows me to avoid the RCA/XLR adapters.
Re: your request for sound signature info, the Olympus analog output is clear and clean, but not harsh in any way I recognize such things. Bass is fast and articulate. Overall, there is no bloat to the sound. Seems very clean and musical. I really love it.
Another listener might have decided to continue to enjoy the MSB investment, and I was on the fence for a bit, but finally, the ability to shed three boxes and harvest some cash...with no sonic downside...was the tipping note. And things here have never sounded better. Wow, it's nice.