I found Tiger to be fine when I was in Thailand in July 2006....
I took advantage of a special they had to fly from Phukket to Singapore for a $1 SIN + taxes...for my family of 5.
It was a launch sale to fly anyware on their network fora $1+ taex (they did not fly to Perth then).
It cost all up about $150 Aus for a family of 5...so very cheap international flying

. Not so impressed was the guy sitting next to me chatting away saying how cheap the flight was...only to discover that he had paid about double what I had...which mind you was still cheap!!!!!!
I had flown my 5 over on QFF rewards with BA to Bangkok...and had return Singapore to MEL with rewards on QF.
I used a special on Asia Airways to fly Bangkok to Krabi for about $100 all up for the 5 of us.
I found both Tiger Airways and Asia Air to be very good...though basic. Both flights had new planes and friendly staff.
In Singapore Tiger Airways used the new purpose built Low Cost Airline Terminal which had the advantage of being small...we escaped very quickly...and the taxi rank was a 100m from customs....so walking was minimised..a great benefit when you have 3 childen and bags to manage.