Ok, serious question. I have used $100 quad rails and $25 eBay quad rails and cannot, for the life of me tell a difference. Last week I looked at a few QR's and decides to take a gamble and buy an anodized aluminum M4 rail on eBay. It installed in seconds, is solid as a rock, does not move, looks good and weighs the same as the name brand ones. I don't mind paying for quality when it matters but what does a $100+ QR do that this $24 one can't?