I have flown with some seriously dodgey airlines around the world, and tiger would have to be up there with the best of them, however for a recent trip to alice springs they were one third of the price of the next least expensive airline.
THeir customer service sucks, they do fly out of Tullamarine but it's from a shed - not the main terminal, we had to wait 6hours in this shed with 2 small children as the flight was delayed....
however, for the price, yes it was an inconvenience, but the plane is the same - it still flies to the destination.

As an aside DH was going to try and get on the show as they had the crews there....I told him if he wanted an instant divorce he could go right ahead....