i went from a prinsu 7/8 to a full rack, and while i am not a fan of the company that owns prinsu, the rack is legit.
It does hum at freeway speed, but it is mainly due to the giant light bar i have on the roof rack, and after a while, you get use to the hum.
Also, while there aren't alot of accessories made for the prinsu, its easy to adapt pretty much any accessory you want by using 1/4 carriage bolts that you can buy at home depot.
I'm not sure why people have a problem with the bent aluminum siderails that make up the feet of the prinsu. It does what it does..hold alot of weight, and I haven't heard of them failing. The only people who have a issue with the prinsu rack are retailers trying to sell you another rack.