My opinion and i'm talking as a DM owner too ( still have the DM7020 I bought well over 10 years ago as well as a DM600 ).
Get rid of the DMM's, their support is dwindling every day due to them taking their image closed source, great reliable hardware means nothing if there is no decent image support. as for ViX being primarily geared towards 28.2 east, thats far from correct, ViX is a truly universal image and works just as well with a motorized dish as it does a sky dish.
multiboot / barryallen in my opinion is worthless when you can backup a image and reflash a full fresh image in less than 2 minutes.