If your friend does not mind not flying the plane during the landing or take off phases of flight for a few years then go for it. If he is a stick & rudder pilot he will not enjoy the experience and should stick to GA with the real flying.
Financial benefits are good although as a S/O you ain't going to get first pick of bases. Qantas works of seniority so you will have to work many years and wait you're turn before getting bases that you want unless you get lucky along the way.