Scoot (new low cost airline)

Launched its first flight in 2012, Scoot is a new player to enter the market which is also based in Singapore. We used their flight between Bangkok and Singapore. The round trip per head cost was around 250 SGD, the lowest when we compared with SQ, Air Asia, Tiger, Jet Star, Thai Air.
Overall impression is good. The quality you get with the price is reasonable for flights extending for two hours. They are flying to Sydney, Gold Coast, Tian Jin from Singapore: for these flights you may be warned for the limitation of services, space of seats if you go for the cheapest seats.
Some note: 1) website do not provide web check in. Need to be at airport well in advance. 2) payment method is limited and in case of credit card payment they will charge additional handling fee (e.g. around 25SGD per head), 3) Flight to Tokyo (Narita?) via Taipei (TaoYuan?) is not up yet though all brochure show as if it is available now.

Tiger air

The third LCC player to be reviewed:
Trip between Singapore (budget terminal) and Jakarta (Terminal 2). I would assume they are the most economic among the three. When compare the price, i do not recall a them to be beaten by price. However this comes with trade off to convenience. Booking process is okay, as I can specify my luggage allowance etc. But I still need to come over to budget terminal. It does not have enough outlets to accommodate the shopping, eatery demand. (Note: Budget terminal will be demolished as of September 2012, therefore Tiger Sir will move to T2.) They also seem to temporarily or indefinitely halted the web check-in function. This was a bit of painful as I needed to follow their strict check in requirement 45 min prior to flight departure, even on early hour flight.
Flight attendant is friendly, on flight food and beverage service is just as same as other LCCs. No flight entertainment may be painful if you are on mid haul flight such as Singapore - Taipei flight.
The number of check in counter is quite limited. Even in Singapore it is usually only one or two, so expect for long queue when check in.

Air Asia

Continued from three (3) LCCs comparison:

Air Asia: I took the flight between Singapore and Langkawi recently. The booking process is perhaps the most friendly among the three carriers.they even provide i phone apps. Others do not. They also use terminal 1 in Changi. I was able to web check in but not for the returning flight. Air Asia provides individual luggage allowance as well as booking meals. You may be wise to order one if you do not want face some hiccups of "out if stock". Range of meal is limited but considering the flight time, I find it reasonable. As for long haul flight (e.g. KL - Haneda/Tokyo), I found the range of service, such as entertainment to be not bad.

Jet Star

I would like to compare the three main LCC players Flying from Singapore from my recent three flights:
First of all, Jet Star.

Jet star flying from Singapore to Ho Chi Minh City. I found the booking process they provide misleading. I could not manage to dismiss the luggage allowance for my family members,therefore end up reserving extra capacity of luggage. Other airlines allow individual selection of luggage allowance. I also got charge fir extraordinary surcharge for credit card payment. Unless I have a Jetstar credit card, I have no choice but pay 50 SGD. EFTPOS may work but not for NETS.
Web check in is quite a hassle. I keep on bumping into errors, time out, as I need to fill in quite amount of information. Inputting four passenger takes 20minutes and was in vain. Error message possibly die to connectivity issue. I gave up and just walked up to counter as usual. Luckily morning flight counter is not that congested. They have several booths for check in.
Jet star uses terminal 1 in Changi. I can book a seat in prior to boarding, unlike LCCs in Europe.

In flight, no entertainment no complimentary food/drinks which is the standard practice among LCCs so there is not much to complain. I can still buy food and drink on board anyway. Flight itself is punctual. One unpleasant incident was at HoChi Minh airport, after check in. Boarding Gate announcement is not correctly displayed. We had to wonder back and forth from edge to edge of airport. In flight sales item, magazines are good quality.