QUOTE(lhooipg @ Dec 9 2011, 05:43 PM)
hmmm...then it will be a very headache question for a new android user like me, whether to root or not to...haiz...

There is no headache at all if you do not need these:
1. Run apps like market enabler to fake telco to have access to more apps , both free and paid
2. Run adfree app to stop all those pesky ads appearing in the apps
3. Run titanium backup to fully backup and restore your apps and data
4. Install clockworkmod recovery so that you can have a full nandroid backup ( your rom plus everything) and in emergency cases allow you a full restore back
5. Run system apps eg setcpu to overclock and to set profiles and voltages - to control battery life
6. Backup your phone IMEI
7. Flash roms and kernels and modem
REMEMBER root will void warranty