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Snaggs, the real difference will concern how easily you can make small movements at high magnification.
The altaz mount I have currently uses preloaded bearings and teflon sleeves to provide drag with seemingly little or no stiction. In practice this is ok up to about 120X but at 200X its a nighmare for example to locate and track a planet; once lost getting it back in the field means switching eyepieces.
Looking at the DM6 it appears to rely on pre-loaded bearings + teflon between the large disks - and I suspect it suffers from exactly the same issue.
OTOH the HH mount uses free-running bearings and rollers to control its motion, with clutches. If the maker has really managed to make this work as well as it should, the HH should be vastly superior at high magnification. The downside is the scope will have to be well balanced, so it will be desirable to use a set of eyepieces that are all roughly the same weight. I've asked how these work on the CloudyNights forum and all the owners that replied were very happy with them and confirmed they can use high powers on 8" SCT's on the HH mkIII.
As you say it craps all over GEM's.
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