Just managed to snap a "copy" of your image - at our balcony. 
Not so much used this timepiece lately, unfortunately.
Not sure why actually because, as you mention, the GMT-mechanism is excellent and it's really user friendly.
I guess it's a bit too "flashy" or dressy for me.
But in another way - it's also usable as an everyday elegant piece, not too thick and even a screw-down crown.
And UN's simple travel-functionality is almost unparalleled IMO.
Have a good weekend,
Best
Bent