I bought these to upgrade older (cca. 2009) Karakorum back panniers. Those came equipped with an earlier version of QMR (not 2.0) that could only be tightened by hand, not with a hex key like even earlier models. It was not possible to properly tighten the screw, the bags slid too easily. QMR 2.0 united the too approaches, now you can tighten first by hand and then properly with a hex key. I used them all summer, they didn't move a millimeter in about 1500 kilometers.
The only problem that they no longer have that plastic tube on the handle, like earlier models did. They made the handle more rigid and heavy, so carrying the bags was more comfortable and on the bike they were less likely to get in the way.
