FWIW, GAMIVITI is a great company run by a true Cruiser Head Tim.
I live about a mile from Tim's place and consider him a friend... so take this as totally biased info
The racks GAMIVITI produces are second to none. They are well designed, low profile, great welds, powder coat it top notch and FULLY CUSTOMIZABLE. I have seen several "one off designs" that customers ordered before they shipped out and they have each been awesome. Am I biased? Yes. Does Tim make some fantastic and affordable overland gear from an unbiased perspective? Yes.
The mounting system they have designed is top notch and I have helped install two on vehicles and they each went on without a hitch.
FWIW, like most of us on this site I am very particular with the gear I buy, I am an ARB, Slee, Toyota OEM guy... GAMIVITI is on par with them all!