...to re-set the GMT sub-dial, as the prior owner was at GMT +8 and I live at GMT -8. After that, however, I can just use the two pushers on the case to adjust the time on the back to "travel time" whenever I am on the road, and only need to adjust the GMT indicator (if I choose to keep things absolutely aligned) twice a year, for daylight savings and standard time transitions.
Right now I'm at home so I have both dials set to the same time -- a push of a button, and I can re-set the back when I get on the plane. Easier than the original Duo, which required a pusher or toothpick to do the task. I liked the sleeker look of the Duo case, but on the Grande GMT the size and appearance of the watch lend themselves to the external pushers, in my opinion.
Best,
Gary