I went with a genuine Safari for peace of mind. It's a known quantity to me from past experience of abusing the one on my old 80 and for the price difference on a one off purchase of such a critical part it's not worth it to me to save the money. The knock offs may prove to be exactly the same materials or at least fit for purpose but with no reliable way to evaluate that myself and having seen pictures of cracked ones on the net from time to time I'd rather trust a genuine one.