i use a Hema with memory map mapping, i also have oziexplorer but its maps compared to memory map are chalk and cheese. a small trick i was shown was when in the high country load the ozi card but instead of loading it as ozi i load it as memory map and it brings up all the 125000 TOPOS, and you cant do that with a tablet. We use our tablet when we get into camp each night.
Just my ten cents worth.
IIRC Hema 6 does not come with Memory Maps only the Hema 5ni.