That is a good price for a Meitner. If it were me, I would go for it.
You can easily sell it for that price, if you don't like it. Actually, you could sell it for more.
FWIW, I use Roon with a Brinkmann Nyquist. I don't need a Roon Core. Only a subscription to Roon and the Brinkmann does the rest.
Probably best to make sure with Meitner if that is so with their unit.
I can understand your trepidation. But, I had quite a learning curve when I moved to digital. I have owned many DAC's, from Schiit to Ayre. Moving to the Brinkmann pretty much ended my search. Though I haven't listened to the Meitner, I have heard good things about it, and I don't think you will be disappointed. Is there a possibility of you auditioning it against other brands at your dealer?
Bob