Well, I now have Win 10 installed in Parallels and it's OK apart from a weird problem in MConfig, which refuses to show my G98DH in its breadcrumb trail apart from it's Store option. The other M units show up and operate normally in the trail (G61RSL & G01) and the graphics blocking behaviour has gone as well. The same .msl files show the rest of the trail fine in Win 7, which I can run concurrently with Win 10 in Parallels. I won't attempt a Store just yet but Fetch works OK.

Meridian do not yet mention Win 10 in its compatibility list though.

What were you finding less satisfactory in Parallels?

G61RSL, G98-DH, G01, Quad 606, Quad 306 (x3), Quad-ESL63 (x 2 pairs, F&R), KEF LS50 (S), Quad 10L sub, Martin Logan Motif (CF) + miniDSP