Not only is border crossing faster, but when you fly your boarding pass will have a stamp on it "TSA Precheck". You go in a separate line, throw your stuff on a conveyor, do not take off your shoes, and are through in seconds. Because I have sentri, the wife's ticket also has it.
Renewal is through the mail and super easy. Just make sure you log into your GOES account to activate the card within two weeks of receiving it, or you send them another $25 and start over ( don't ask how I know this...)
Sitting on a beach south of Cancun as we speak...
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