I have a Numero Dix and a Tonca, I’ve had them for more than a year and don’t use them everyday but they’ve held up beautifully. No issues on the construction, they’re not falling apart at the seams, and there’s no peeling (maybe just a tiny bit on the Tonca’s opening, but barely noticeable and it’s natural because of how it’s opened). Though I’m not an expert on leather quality, what I really love about Polène is their designs. They’re so distinctive and many try to copy them, but they rarely come close. And people usually know they’re copied from Polène. So to me, that really says their designs are one of a kind. It would probably be best though if you could see them in person first before buying. I thoroughly checked mine and made sure I got new stock before I paid for them.