Has anyone ever heard of a Hoyt split-limb failing under normal use (that is, without dropping, slamming in a truck door, trampling by a bull-moose, etc.)?...I haven't!
The Vtec listed in my signature for sale had a delaminated lower limb after maybe a dozen shots. It delaminated in the shop before it was even taken home. Hoyt replaced the cams, strings and cables as well as both limbs on the bow.
I have owned around 10 different BowTechs and I have never had an issue with any of them mechanically.