Yep, the first two they mounted the rack hooks too low so the quick release snap could "snap" into place. The third pair a zipper stopped working (no matter which may you moved the zipper the pocket was open -- thankfully it was a tiny pocket for hold keys or somesuch!) and one of the screws that held on the stabilizing bar fell out. I found the screw at work, but didn't realize what it was for until I got home with my panniers (and the screw was still at work). Thankfully, Trek has a 100% lifetime warranty on these things, but if something else happens, I'm getting a different pair!