I used mine very day for work for 4 weeks, took the train too, it was fine. I biffed it the other day and later on when I was putting her to bed, I noticed a slight mark on the edge; it came off with a damp cloth, good as new. My Kelly has actually started to look better after using a bit more - she's a relatively new bag - Nov 2006, and only brought out to sniff or for careful outings at first. Now I am much more relaxed - even took her out in slight rain the other day and it just wiped off with my hand. My SA said she would build up a good patina with use and to use her a lot and not be afraid. I'm glad I can use her every day without worry, it feels like I am getting good value for such an expensive bag and it pleases the DH to see how much she is used (it was a present from him)