The system works together really well but I am concerned about a few small details. No doubt Thule has tested them, but the attachment that holds the bag on the rack is hard to open, especially when there is no bag on it. It might loosen up over time, but it's notable. The attachment also has a weird controured design that made the side panel incompatible with one of my racks due to the space available being less than the width of the bracket. That bracket doesn't seem to be wide in a structural way so this might be a solvable problem for future designs, and it is specifc to that specific rack.