I took a NOW Voyager courier flight some years ago (TWA #800 as it turned out) from JFK to CDG. At that time the savings was substantial, particularly as I put the trip together a week before departure in peak summer season.

These days courier flights are less appealing, as one can - with enough advance notice - generally find a fare sale to your destination of choice that often times is not significantly higher than the courier fare. Plus, there is no guarantee that you will get FF miles for a courier flight although I had no problems there (you will have to provide your # at checkin since the courier co won't do it).

As for you "job" responsibilities, they are almost nonexistent. You meet the courier rep at the airport, grab an envelope, and go. You hand the envelope to the courier rep at the other end and you're done. It's a big plus knowing you won't be waiting for luggage from a packed 747.

All-in-all, an experience I would highly recommend if you will save a few hundred $$. But for $100-200, it's probably not worth it due to the inflexible rules on flight bookings (e.g trip must be often be exactly 7 or 14 days) inability to make changes. The best bargains are for last minute trips booked within a week of departure - and you should feel free to negotiate fares down.