I have their waterproof pannier bag -- it's nicer than I thought it would be. The hooks have been fine so far. I could see how you might have to tighten the placement knobs (the hooks slide on a rail to fit different attachment points) every once in a while, but it hasn't been an issue for me since I've had to move them between different racks. I think there was an Amazon coupon (the "click here" kind).