I don't even give out my buddy passes due to the headache of dealing with a friend who get stuck (exception being if I'm flying with them, then they share employee priority). Flights are extremely full these days, last minute airfare can be sky high, and hotel+rental car+ eating out the first night of getting stuck typically exceeds any savings.
If you do use them, always leave on the first flight out of the day, always plan 1-2 days of getting stuck and standby around at the airport (paying airport bar/food prices), and be willing to risk not getting to even go on your vacation if you get stuck leaving. IMO not worth it.
We jokingly call them "strand a friend tickets"