I haven't broken mine yet...
...and I'm trying to!
It's been my work edc for 9 months now, and I beat the ever living crud out of it.
It's been sharpened once a month whether it needed it or not on a lansky, then final touch up on a 204.
Spray it down with WD-40 and hit it with an airgun once every other week.
440c takes a wicked sharp edge.
Flicks open faster than a snot shot in a farm field.
When this one dies, I'll get a 551 to replace it. I think I might like the thumb studs better.
Johnny B.