Root Advantage
+ can backup apps you want
+ have privilege in certain apps... some apps use superuser

ROM
+ if you buy new samsung phone, the ROM you use is stock ROM, have touchwiz, ROM like windows we use..

role flashing ROM (use clockworkmod recovery)
+ if you want update you phone manually, like we use windows update manually
+ if you want use any custom ROM, like we use change windows to ubuntu
+ if want to flashing ROM, 1st read carefully and understand what you doing...
dont understand, ASK..but most important is READ first.... because some people like ask like their didnt read anything..

who doing to your phone dude?
pity to you, ask new phone lah....
that note price is luxury item...

SEP= samsung elite partner (special got 2 year warranty SME)
SME= samsung malaysia electonic
SP= screen protector

try this, i dont know KL road, but hope this list can help you

Samsung Elite Partners (SEP) List at Malaysia

Petaling Jaya Convergence Gadget Sdn Bhd ~ SK 2A 2nd Floor, 1 Utama Shopping Centre, Bandar Utama, 47800 Petaling Jaya, Selangor.
Johor Bahru UI Mobile Sdn Bhd ~ Lot 1-08, KSL City Shopping Mall, Taman Abad, 80250 Johor Bahru, Johor.
KL AMS Mobility Sdn Bhd ~ Lot 1-TC 1-31A, 1st Floor, Low Yat Plaza, 55100 Kuala Lumpur.
Melaka Steven Tele-World Centre Sdn Bhd ~ Lot KG 6E, Ground Floor, Mahkota Parade 75000 Melaka.
Penang Mobile Spirit Sdn Bhd ~ Lot 2C-K-06&07, First Avenue Shopping Center, Penang.
JB Incomm Marketing ~ Jusco Tebrau City, JB.
KL Welfon Telecommunication Sdn Bhd ~ Lot No T-242A Third Floor The Gardens Mid Valley Megamall, 59200 KL.
Klang Ashita Communication Sdn Bhd ~ Klang Parade, Klang.
Negeri Sembilan Ashita Communication Sdn Bhd ~ Terminal One, Seremban.
PJ Netzcom (M) Sdn Bhd ~ S14 Digital Mall, PJ.
Ipoh Arrow Link Telecommunication Sdn Bhd ~ Greentown Mall, Ipoh.
Puchong Welfon Telecommunication Sdn Bhd ~ IOI Mall, Puchong.
Seri Kembangan Ocean Eleven ~ The Mines, Seri Kembangan.
Klang KTS Cellular Sdn Bhd ~ Klang High Street, Klang town (KTS Head Office).
KL BBS Distribution ~ Sg Wang Plaza, KL.
Ipoh Life Choice Telecommunication Sdn Bhd ~ Jusco Ipoh, Ipoh.
via: Samsung U-nivez

what i see at the graph and apps you use, you are heavy user, ok la tu....
if want to use for 2-3 day, you use for call and sms only...

the different is about warranty only, maybe some of supplier not give original accessory..
better buy SME set, if got problem easy to solve...