I've had a couple of minor rolled edges, nothing big, and what you could expect from any manufacturer.
I've had two blades, an M43 and a Seax that came with forging problems that I returned immediately for replacement, but that's out of many, many purchases over the past 3 years.
I've had several that needed handle work, and one Crow that was really poorly done by a new kami at the time, who now does great work. One Bura Cherokee Rose had some waves on the spine that a flat bastard file fixed in 10 minutes. I kept that Crow but probably should have called it a loss at the time, although I have reprofiled the blade into an interesting looking knife, so I guess it wasn't a total loss in any case.
The Museum Model was the first one I have had self-destruct on me, and I still have hopes of salvaging it, (if I can ever find time to work on it.) At that it withstood over 100 whacks as hard as I could swing it into an ancient rock-hard railroad tie (while wearing a heavy welding gauntlet as this was just after Steve's MM operated on his hand

), and only after all that did the front ring brazing begin to crack slightly.
I always thought I wanted perfection in knives. I have dozens of production knives made on machines that are perfect. Also many custom knives that take far longer to make than a kukri and cost a lot more, many of them quite beautiful, but it's the little imperfections and unique individual touches that make these knives so unique and irresistible.
Norm