I'm a level 2 archery instructor and have taught archery classes for my club for many years. We offer participants the option of using our equipment, which consists of recurves similar to the now discontinued Samick Sage and Genesis compound bows, or using their own equipment. We inspect all bows brought by participants, and so far there have been no safety issues.
There have, however, been quality issues. A boy about 12 years old showed up for his first class with me recently with a new dual shelf bow that I knew from the moment I saw it was junk. I brought out a club recurve, and let him shoot both. I think the boy could tell that the club bow shot a lot better than his bow, but since his parents had just bought him the bow and paid for 4 lessons, he evidently didn't want to hurt their feelings, so chose to shoot his own bow for most of the first 2 lessons. At the beginning of the third lesson, we were shooting at 20 yards and most of his arrows were going into the dirt. I knew he was capable of better than that, so I brought out a club recurve, and the first 6 arrows he shot from it all went into the target.
This was a pretty convincing display for his parents, and they agreed to buy him another bow like our club bows. We'll have his 4th lesson this Saturday, and hopefully he'll show up with his new bow and appropriate arrows. The first 2 lessons weren't a complete waste, as I was able to teach him correct form at a close distance with his junk bow, which was why he was able to put 6 arrows into the target at 20 yards with a bow he had never shot before.
There is no reason anyone should be shooting a junk bow, when perfectly adequate recurves can be purchased for less than $150. The same cannot be said about compounds, which cost more than that for a decent entry level bow, and have to be adjusted to fit the shooter. Genesis compound bows do not have to be adjusted to fit the shooter, but I would never recommend that anyone purchase a Genesis bow for his personal bow, because too much performance is lost in order to have the one size fits most feature.