Here's my Medium Puzzle in the classic Tan/Gold colour, and I have had it since Jan 2020 and have used it consistently, at least twice a week, and I must say the quality is impeccable... absolutely zero corner wear, zero glazing issues, zero scratches on the hardware, minus the feet, etc. The only thing that has 'aged' is the softening of leather over continuous use, as well as being constantly stuffed with items inside - which can be most evidently in the body of the bag, and also the handle, as I like to hand carry it a lot). The only thing that has some wear is that the light coloured fabric interior has some dirt marks, but that could be easily resolved if I bothered to clean it - so that's on me.
Below is a side by side comparison of my Puzzle when it was about a week old (left, taken on the 8th Jan 2020) and on the right (taken on the 11th April 2021).
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Hope this helps anyone in deciding! Long story short, I highly recommend it, and I am intending on getting the OG Small Puzzle, and the Mini Puzzle in the future - because I like the design and functionality of the bag so much!