I have the saris bones 3. No problems with it yet. Have to be careful on where it attaches to the car. While I have had no issues with it, given that the arms are held in place by quarter inch plastic screws sitting on threads, i am not all that crazy about putting my entire bike on it when going on long trips on the interstate. I mostly use it for in town trips. when i do go lond distances, i usually remove my wheels and just attach the frame.
maybe i am just being paranoid