Anyone ever break/bust/crack/fracture the factory 273 adjustable rocker arms?

I just had two sets of 273 rockers/shafts reconditioned at Rockers Unlimited. Used to run these back in the day on my 273 bracket car. The current ones will be used on a 340 and 305 (de-stroked 340) I am building.

Just wondering what kind of failures (if any) others may have experienced. Fotos would be interesting, as well. Thank you.