I would have said 3 stars for "adequate" but they get a "pretty cool" rating because they do attach to nearly any crossbar. I attached my Yakima Raptor bike holder with the mounts, and it worked fine. However, they weren't confidence-inspiring in that they didn't fit as snuggly as factory-specific mounts. Never got that death grip on the crossbar I was hoping for. Still, I drove over 500 miles, most of which at 80mph, with a 30lbs Niner on the roof and everything stayed put.