42 mm Space Grey here--
Still looks like the day I took it out of the box, and if there was any little thing wrong, I would notice. I'm picky like that.
I am worried about knocking it against doors and doorways, because that's how my old watch got all of its damage. However, I have noticed that I've been more careful about not knocking it into things than I would have my old watch, so maybe that will keep it from happening.
As far as the band--I have been out on a few walks and done a few workouts on the elliptical and it still looks fine. There is wear from where the two parts of the band come in contact with one another, but anyone who has ever worn another kind of watch before, especially with a leather band or some other non-metal band, knows that this is to be expected. It doesn't show on the outside of the band, therefore nobody sees it, and honestly I wouldn't care if there were some visible wear. Bands can be replaced if they start looking too gross.