I ended up returning this rack. I wanted it to work for me very badly. I usually drive 130 miles with my kayak to where I go floating. When I'm there I need to be able to put 2 kayaks on top of my car. My problem is that this rack system combined with my Yakima whispbars didn't seem to want to take the weight of 2 kayaks with the rack centered. If I put the 4-in-1 Sportrack on one side for better weight support then it becomes inconvenient to load and tie down the 2nd kayak. I already had Yakima Jaylows which pretty much does the same thing. I ended up buying another set of Jaylows in order to be able to easily load, tie down and unload the kayaks. Each kayak gets it own set of Jaylows.
For younger and stronger individuals this 4-in-one rack would probably work.