This bag has been around the world with me on various travels. It's been covered in mud on one occasion, drenched with rain on several others, and dropped more times than I'd care to admit. Through all that, it's kept my gear safe and sound, and still looks remarkably good, with nary a stitch out of place. I'd easily expect another 15 years out of this bag, possibly more if I get less adventurous!
The one build quality related flaw I've found is that this year (even with regular care) the leather portions on the bottom corners of the bag have begun to look quite worn out. All other leather on the bag still looks immaculate. I will probably get around to having Wotancraft replace those pieces at some point.
As a wedding photographer in Tampa, Florida, it's served well as a side/secondary bag for parts of the day where the bulk of my peak design backpack is too much as well.
Overall, highly recommended!