I know this is an old thread, but I wanted to share my thoughts because my City has quietly become my favorite office bag!
I, too, questioned at first if my Bbag was too casual for work... I work in what can sometimes be an ultra-conservative field, so I've always erred on the side of no flash, no logos, black, structured, nothing extravagant.
But I find my black Bal City a nice, under-the-radar injection of personality in what is otherwise a monotonous wardrobe of suits, pencil skirts, and pumps. It has just enough structure, and I do think the smaller G12 HW keeps the bag subtle with just enough sparkle to keep it interesting. I think it feels a bit more modern and fresh and more "like me" than, say, a saffiano tote, or something else super-structured that might be more typical in the workplace.
My Black mRGGH City on the job:
Great for work, great for play... I love this bag!!