Compared to total SU sales? Very few. It's the nature of this and almost any other gun forum that you will read more about failures than virtues. Most people who buy a new gun and have no problems with it have no reason to post about it. Unless they are some of those rare ones who signed up to research one before a purchase, and want to follow up with their experience.Mines not broke, in fact I have had zero problems, but every time I read about one breaking it makes me wonder about the ratio of su's sold to people having problems.