Those aren't wear spots. Funny thing is I saw that too when I was posting the pic. (I thought it was maybe oil/dirt from my hair) So I went out to clean it to get a better pic. Upon further examination, I found that it's a subtle indentation. The camera/flash must have exposed it un-naturally, because it's bearly noticable in person.
I've had them for a year now and they're great; easy clean up and no visible wear. They get hot in the summer if you park in the sun for long periods, but no different then the leather set in my wife's car. If you've had leather seats before, you probably can expect the same. The gray shade is in between the headliner and silver/graying accents of the stock xB. I think it complements the stock interior very well, and lightens it up too.