In 29 years of construction work I've seen exactly 1 broken Estwing hammer. And I've broken one of their I-beam pry bars after many years of abuse. Many years ago I had one of their 28 oz. straight-claw framing hammers. After a couple years of use the neck was pretty badly warped from pulling nails sideways (framers know what I mean). It didn't break but I don't doubt that it soon would have if I didn't retire it. I switched to Vaughan wood handled hammers for framing and finish but I still use a 20 oz. Estwing for concrete work. They are very very tough hammers.
When I was young, dumb and full of ____, I actually had a 32oz Estwing Framer.
But that was before I discovered shingling hatchets (28oz).
For Framing, I use Stiletto Titanium Hammers (have a 14oz & 16oz).
I have a 20oz Claw hammer for trim work (going on 10 years now).
Like others, I've personally never broken one, but they've just grown
feet and walked away from my sites (stolen).
It'd take me about 3 years to wear down a shingling hatchet. Even then, I could re-mill
the face and always use the hatchet for demo work especially in compact areas.
Gives me an idea. I'm going to take one my roofing hatchets and convert it into a survival tool.
It's worn enough that I can justify buying another one (even though I barely use it because I
went all guns a few years ago). But I could re-mill the face and try to put a nice edge on the
hatchet and easily utilize it to make kindling and to pound stakes and break rocks. I can use
the bottom of the hatchet to easily scrap bark from a log. Plus, it's an excellent digging tool.
Wow...I think I have a new project in mind!