Why they cut better: the blades are taper-ground, tang to toe and edge to center, and the tooth set is tapered too. The saw clears its own kerf and tracks straight, so cuts come faster and truer than a machine-made saw. That is the point of the handwork, and you feel it in use.
Why they last: the whole saw is hardened by hand to around HRC 60 for long edge retention. Other pull saws use cheaper, softer steel and impulse hardening. Because these are not impulse-hardened, you can resharpen them. When you would rather swap than sharpen, the blades are replaceable. They are made by master craftsmen in Miki City, Japan's traditional toolmaking region.
One caveat, the same on every page: natural wood only. Plywood, MDF, and anything with glues or epoxies will damage the teeth.
Want the detail on why hand-filed teeth cut differently from machine-set ones? We wrote that up here.