delta76 Interesting comments. I'm retired so have time to spend chasing every microgram of weight/WDT/RDT etc etc!
BUT I am tiring of the lengthy process that single dosing requires or certainly encourages. More importantly, the other two family members will not engage at all, which is a pity. MK E64/ Mini G would enable them to just press the grinder button (that I have dialled in for the beans in question) and get the 'right grind' and hopefully therefore good tasting espresso (we don't drink filter) every time without needing to think about or get involved in 'tinkering'.
AND for me, I would really appreciate the design/engineering/espresso quality that hopefully these GBW hopper fed grinders should deliver and all for c. £1,000 or less. Win, win!