So I have three sets of sights from XS, and I love them. However recently the "Big Dot" white insert in the front sight of my M&P just fell out during shooting. I emailed them and almost three weeks later, I have no reply. I'd hate to abandon them for one incident, because I really do like their products, but if they aren't even going to acknowledge me, I won't spend any more of my money with them. I was curious about anyone else's interactions with them, if any? Thanks everyone!