The metallic Mabels & Agynesses are goatskin leather and it seems much more robust.
The bronze Bayswater, Emmy & Alana are all coated glove leather and, yes, the bronzing will eventually wear off on straps & corners. It would also scratch off so you have to be quite careful with the bags.
My Bayswater has got minor wear at the corners where the bronzing has rubbed off but it is not noticeable. And I'm sure I've scratched it (I scratch all my bags
) but the bronzing hasn't been damaged.
I know this would bother lots of people, especially with such expensive bags, and I think that's why the bags were sent straight to the outlets and not sold in stores. I'm happy with it as the bag is so striking. It does seem to be a common problem with metallic leathers, though - I've heard that Marc Jacobs metallic bags aren't very robust either.
The metallic glove is SO different to the metallic goatskin though - much less subtle.
One thing to bear in mind is that most of the bronze Alanas and Emmies have chocolate straps with them - this is to show the colour the bag will become in the areas that the bronzing wears off. It doesn't look too bad in photos but IRL it just looks like you've got mismatching straps. So definitely look out for this.