Boa "squeezes" other mounts to death!
I likey the Boa. It is small, simple to use, more versatile, more aerodynamic, less ugly than trays, and oodles cheaper too. If you trust your face to the front wheel cam locks when you are riding around on your bike, no reason not to trust the same concept when it is attached to your roof. I have not used on any extended long distances yet, and actually have not even broke 60 mph yet(have not needed to yet), but so far has held up real nice. It is also a lot quieter sans bike than a tray as well. Installed on 07 GMC Envoy. Muy bueno!