I have done a ton of research on them and have done several articles. Most of the reports you read on a forum are pure balderdash. Most injurioes and there are not many are self-inflicted and involve the thumb being hit by the string. There are a few of thiose because you can't cure stupidity. As for mechanical failuers, about the same as with compounds. There are no more hunter on hunter events than there are with traditional equipment.
Two good sources for you: Ohio DNR and the ATA. Contact Vickie Snyder at Ohio, she is a wealth of information. If you want, providing I can find it, I will email you my research info. It will be later today, I am leaving in a few minutes to go kill deer.