using the Temasek's unofficial CM11 V10 with Boeffla's Kernel CM11 2.1, i don't know about CM installer anymore ahah google asked the team to remove it from the playstore, oh and yes you don't need to root your phone ... : the installer will root your phone if he is not) in other words, custom rom kernel or whatever interesting : root obligatory, the only thing not interesting on any android device is not rooting it.
the process of root (with odin) flashing a recovery (with rom manager lite or pro) flashing a rom (with CWM 6.x.x.x+) is so simple, the CM installer is not really more simple. all tutorial are well explained on XDA GT-I9300 android developement subforum (for CM11 and non stock)
battery life better combo (if you are in my case and like to test 4.4, since samsung did a fubar 4.3), then Temasek's CM11+PA GAPPS+Boeffla's 2.1 CM11 Kernel with the Boeffla's control app from the store and with the preset battery saving or battery friendly, i get from 2 days to 2 days and a half instead of 1 day on battery, also with the profile "power extreme" no PSP games run under 49-60fps in PPSSPP, ART instead of Dalvik, Antutu : 20820 which put that GT-I9300 above the Xperia Z, Note2 and the Nexus 10, 4k~ under the HTC One (QC S600) 5k~ under the S4 with the fake Octa (4+4) and 7k under the S4 (QC S600) , not bad for a Quadcore Cortex A9 Exynos 4412 with a Mali 400MP4.
raw computational power single core and multi is 31755 and 127020 when you compare to other more modern S.O.C it place it between the Exynos 5 5410 Octa 28150 and the 5 Octa 5420 34020 a S600 is 34300 Tegra4 36860 a core I3-M330 45720
D) S800 45720 (yup a Qualcomm S800 is on par with a i3-M330) i3-3110M 62200 i7-950 80150 FX 8150 95310 (its from the app CPU identifier reliable or not ... i don't precisely know
)
it's a Nightlie (aka it could be unstable) but pretty much good to go as a daily runner i'm amazed of the stability and the regular update from Temasek's (way more reliable than the brand's roms) and 4.4 have a really nice feel (got to get used to some news feature, the phone app is kinda disturbing at first time)
funniest fact ever 4.4 optimize Android for phone with 512mb ram and more, which make more and more "old" model eligible for a custom based 4.4, so if a brand say "your device can't or will not handle KitKat" then it's pretty much a "we want that device to die so just buy our latest new and supported device" thanks XDA to be here... (plus, being Swiss i would be sad to not have 4.4
nestlé and KitKat: Swiss
) 4.4 on Note2 and S3 is not scheduled before 2014 and mostly after the S4 who will be updated in January, rumor about no 4.4 before GS V because Samsung would like to launch it with 4.4 ... way to go sammy delay a update who is already available for weeks to a couple of month because of your next flagship ahahah oh wait don't care Samsung stock roms are dirt-bag (unless modified and de-bloated)
) buuuttt the color isn't at my taste 
so choosing beside black, navy blue and green camo, was pretty easy ... everybody has black white blue in the end that pinkish red of the Valkyrie sounded not so bad but green camo is a bit less "HEY I'M HERE!"
