One question is how close will MQA decoding in Roon into MS200 into legacy DSPs get to MQA decoding in a 218 into legacy DSPs?

Neither will go higher than 24/96 presumably.

Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.

Purdeys, Moke, Leica, 'Blad. Only the best.