I'm checking flights for the next dance comp I'm thinking of going to for which I have not yet booked - a comp in July, in Canberra - and the flights available which are the most convenient times... are Tiger.
Leaving Adelaide on the Friday, I can catch a direct flight with Qantas at 6:40am, or a direct flight with Virgin at 6:20pm (which arrives after the Friday night activities have started) or I can take the 1:35pm Tiger flight (and get dropped off at the airport with free wireless internet at 11:30am).
Leaving Canberra on the Sunday, I can catch a direct flight with Qantas at 5:55pm, or a direct flight with Virgin at 4:30pm, or a direct flight with Tiger at 7:40pm - which even with the extra time needed to check in for Tiger flights still means that I'd only need to arrive at the airport at a later hour.
This is leaving aside the fact that the return airfare with Tiger ($58+$68=$126) is cheaper than either of those one way flights with Qantas ($147 each way), and approximately equal to the Canberra -> Adelaide flight with Virgin ($129; Adelaide -> Canberra journey with Virgin is $109)
All prices quoted do not include booking fees, credit card fees, nor checked luggage. All Qantas non-direct flights are more expensive. There are some Virgin non-direct flights which are less expensive, but they're at completely inappropriate times.