doloresmia, i've pretreated all of my bags and have never noticed a difference in the leather. I usually use Apple Guard conditioning lotion first, then Collonil waterproofing spray (the same brand that Mulberry recommends). All of my bags still look brand new, but I do baby them a bit (don't ever let them sit on the floor, etc.). As for the Aurora in particular, I haven't worn it yet...have been meaning too, but too many other BVs to pick from at this point

... will be sure to do so before the end of the warm weather, and will keep you posted!