Compliance with logos and wording for USB

I have a device that uses USB. USB requires companies to purchase vendor ID's, and complete compliance testing in order to use their logo. As far as I can tell, if we do not claim to use USB through the logo, testing is not required and we can move forward at our own risk. I am not sure if I can use the words USB or if there is any risk in this legally. As far as I can tell...there is none. Any thoughts? http://www.usb.org/developers