I'm not the original owner of the rosemary. When she was bought for me, she already had some watermark stains - they were very faint though. At first I tried not to mark or stratch the leather, but I think that's slightly impossible if you want to use the bag as an everyday bag as I did. It is marked, but I still love it. The marks aren't hideously obvious or anything, especially not when worn, it's just something that can be seen on closer inspection.
I'd recommend Darwin leather to anyone who doesn't mind if it's not kept in pristine condition, that's not to say it looks old and beaten up, just not in mint condition. I think it's a great everyday bag, but if you're in an overly rainy area, it's probably not a perfect match either.