Very good if overpriced product (like most rack accessories). Use on a small SUV for wooden and composite hulls. Throw a small piece of carpeting on top of rear roof and loading/unloading becomes easy one person job.
Confused by previous review questioning quality. The plastic wing nuts have brass inserts, yes the units are plastic but that is so they conform better to your hull shape. No problems in three years of hard use.
An added benefit is that by the kayak being flat rather than on it's side I can park in the garage with the boat loaded.
If not for the price would have given them a 10.