I've had my small rose des vents one since March 2020, and so far it's held up really well. Looks brand new to my eyes, and I use it all the time. I store her out of sunlight, upright and not touching any other bags, but not in her dustbag. Ideally in a cool, dry place.
One thing is I find Patent heavier than other kinds of leather, which can be annoying. My biggest fear isn't necessarily color transfer, but rather, the coating breaking down over time and her getting that tacky feeling. Anyone know how to prevent this?