I often use budget carriers to visit places like Thailand. Have even used Tiger when they 1st started operations. I remember back then they would even give you a complimentary orange juice before the flight.
The reason I stopped using Tiger was because of the mistakes made by the management. In my case I was using a Mac to book my tix & they made some changes that made it impossible to continue using a Mac to book a ticket. I gave them feedback about the problem but they never fixed the problem for at least a year, after which I gave up on them & started taking Airasia & later Jetstar.
Have taken a look at Scoot but the problem is with the odd schedule of their flights. Don't want to reach BKK at night.
Doubt Temasek will be successful in budget carrier business because they are out of touch & don't understand what a "budget" means