We have been providing rotor bars with chrome alloy constituents to operators for about 10 years. We don't actually know how long they will last, since we don't know of anyone who has actually worn them out, as yet. life expectancy (we think) should be at least 2000 hours -- likely more than that. Disadvantage is that they are slightly more brittle than ductile iron standard bars. The front skirt of a bar may break a little more readily if you pick up a rock. On the other hand, if this happens, the broken pieces will be smaller and will do less damage to the rotor, concave, etc. We haven't had this happen much, but custom harvesters who work in Montana rocks appreciate these facts. HOpe this helps.