I'm planning on getting a small wallet in perle vernis (for when I'm carrying a small bag), and possibly a keyholder as well. I wouldn't worry too much about keeping them clean, as long as they're inside your handbag they're safe.
But ... I've just bought the agenda in framboise and even though it's a darker colour, I'm still going to have to be more careful than I usually am. I very often go to make a note in my current diary and just plop it on top of whatever's in front of me, usually either my cluttered desktop or the adjoining table, which is covered in stacks of printed out computer paper. I often sit my diary on one of those stacks of paper and that's a habit I'll have to unlearn when I start using the agenda, because it's a total no-no with vernis, particularly light coloured vernis. But when you know you have to be careful about something like that, you just adjust to accommodate it. If you love the perle, go for it!