OT (sorta) full-torque inserts?

has anyone used full-torque brand thread inserts to repair a threaded hole in cast iron where the iron had cracked around the hole? Did it make a satisfactory repair? Asking for a friend who is looking for a "quick fix" for a SBC where the starter mounting holes have suffered some abuse.

Also am curious as to the prices of these kits. They just look expensive.

thanks,

nate