Yes, that's right - certainly the other two devices have not been tested against the newer ETD standards that the QS-B220 was tested against to be qualified, so those devices cannot be considered "state-of-the-art". So I think everyone is reading this correctly, this shows NIST needed a state-of-the-art ETD system, they already have the other two systems, and the only one available to meet this requirement is the QS-B220.