Great for making space.
I use my MultiMounts with a 4" diameter PVC tube for fishing rods. Numerous 12 hr trips to Canada and back and no problems. Never had a strap loosen, always very secure. Use the Yakima Accessory Lock Housing ( http://www.backcountry.com/yakima-accessory-lock-housing) to make sure nobody steals your mounts in the parking lot.
These mounts have opened up a lot of space inside the cab of my truck. Its hard to transport 7ft fishing rods and four people with all their Boundary Waters gear inside an SUV, but the Multimounts solved that problem.