I have it in Ebene and havnt had any problem with it. Its my everyday bag
It really is a pretty bag however I chose the mini lin speedy in ebene because it is easier to clean and maintain and doesn't get dirty or show dirt. I found that the bag was a bit bland and too pale for my tastes. However if you love it and can maintain a bag, go for it!
I'm not sure about the rain but an SA told me that the Dune was hard to clean because it's so white, so if you get dirt marks on it, it might be hard to come off. Also it takes a lot to maintain it to keep it from getting dirty because it's so pale. But if you're careful with it, I'm sure it would be worth it. I would go into an LV and see it for yourself and talk to an SA.