I have this setup as well and I am a bit disappointed in the quality of the bags. First issue was that the screws that attach the KlickFix attachment system to the bag were very loose, one had come off completely on my second short ride. NBD, I just tightened them all up, they were quite loose. I encourage others to check theirs. The second issue is more concerning, the bag literally started to come apart at the seams. This happened because there is not a 3rd KlickFix attachment at the front of the bag, where the majority of the weight is held in the bag, this causes the bag to pull away from the rack and the stitching failed. I had my first aid kit, 32 oz water, 16 oz beer and a puffy in the bag.
I contacted HQV and they told me to go through my dealer, thanks guys. So I did some research, found someone who sells the same KlickFix attachments (they're made for bicycling, Velo Fred was the site). I added a third attachment to the the bag, there's juuuuuust enough room for it (you have to make sure the mounting discs inside the bag don't interfere with eachother. It is now much more securely attached at all three points on the rack.
These bags look very cool, just like the concept. Hopefully with my fix they will also be functional....