Low power makes sense for not just home but all miners. If any line can only take x "powerful" units, compared to 2*x "low power" units it's increased sales and farm are happy with full racks. Although the efficiencies need be there. The A911 sounds great still lot's will be waiting on the 941 release.
A lot depends on its down clock ability.
the 841 was great to down clock and you could increase efficiency at low settings
the 851 was great to upclock its best efficiency was at full speed.
so if the A911 is tweaked like the A841 it will be good to down clock
if the A911 is tweaked like the A851 it will be good to up clock
common sense says to tweak it like the A841.
I am eagerly awaiting a reply from Steve of Cannan to see if they have some for me.