I've had my Midori for almost one year and it's aged beautifully. I can only imagine how it ages in the next year. Though, I won't be carrying it around as a planner for 2016 so the accumulation of scratches will take more time.
If you're on the fence about getting a Midori, I urge you to get one. I love this thing and am pretty sure I'll always use this system in some capacity. Of course, if you don't like that scratched up look, there are a ton of faux-doris that you can choose from on Etsy. I kind of want a Chic Sparrow but I am not justifying the purchase at the moment. (If anyone has one for sale a good price, holler at me.)
Here's now it looked the day I unboxed it (with the original elastic):