Hi there! I have been collecting Epi for 15 years and I have never had a problem with staining of any kind, and the Epi never scratches, but I am mindful when I carry any of my bags. I say go for it! I really love the Epi, especially the fuscia- I just got the fuscia and mono long wallet myself, to go with two or three other fuscia bags in my collection. Good luck, and wear in good health!
If you have a look on eBay you will see that many older Epi pieces don't look so great. I have a key holder from about ten years ago which has peeled at the corners. I wouldn't recommend Epi for pieces that are going to have heavy use. Canvas is much more durable. Having said that, I have never had any issues with scratching or colour transfer. Also, my newer Epi pieces have held up better than the aforementioned older style key holder. My business card holder has been in my bag every day for nearly two years and looks brand new!