Highly recommended! I've used mine for about 6 months now. Never had a problem, and bypassed many a line up. Most major airports in Canada (where they have US INS pre-flight inspection) also have the.
And, if like me, you are a regular trans-border traveller, you can also get a CANPASS, the Canadian equivalent. Problem is, you have to go back two weeks after initially applying, and it costs CAD$50. Still worth it, though, given the amount of time you save.
Regards,
Ken Hamer
[This message has been edited by KenHamer (edited 06-10-1999).]