I bought a set of Viking bags and put them on my Kingpin. I have since traded it, and I only had them on a couple months. After about 2 weeks I could not get them to lock. I never really looked into why as it wasn't that big a deal to me, but they did seem to have cheap lock hardware. The bags seemed solid otherwise. The ones I bought said they would fit on my Kingpin but not with the hardware they provided.. I ended up getting the Quick disconnect brackets.
I also found it odd that they send me two bags and each had a different lock. So two more keys to keep up with.
2013 Vision Sunset Red - Stage 1 exhaust, VictoryHID Cyclops
2004 Kingpin - Traded