I've used them both, rod kits for rebuilding cranks and whole cranks. Never had an issue. Guess there always could be an issue, but never have had one so far. The only thing they don't seem to do is balance them very well. I have balanced them before if they were way off. That also could be from handling from warehouses etc. Some get dropped, some get tossed, but that is the same with direct from manufacturers as well. I use to work at a Honda warehouse. It was called American Honda but was in Iowa. Just for the dumbies who wanna call bs, just because it is an American Honda place, it doesn't mean it's in California, and it doesn't mean it was for the racing teams :-( . Anyways, I saw things being tossed around, like pistons etc, because there were bins that each part had to go into. Well, lazies would just toss parts from their group of parts, as they seperated them to be shipped to seperate dealers. By the way, didn't know Weisco made cranks or crank kits? If that is the case, sure they do good stuff..