ling, I don't have experience with black swift, but, I do with etoupe swift. I've only see pictures of the black and it looks heavenly.
The swift skin is fabulous to the touch and resists scratches. I was touching the inside of my bag with my fingernail ( it's swift lined ) as I putting things inside and when I inspected it, there were no scratches or marks of any kind.
Not to say it does not scratch, but, that you don't have to baby this skin.
I have heard from others who have been caught in the rain with swift that you need only to wipe it off and it's good to go. I have not had that happen yet, however, so I don't know how much water or rain it could stand....maybe someone else could tell us?
And....the biggest thing with me is that Swift feels so nice to the hand and has a lovely scent. I even like the way it looks....kind of matte and touchable looking.