I already use the MIUI Rom, it quite good but i not recommend for everyday use. Bear in mind that the base of MIUI come from the cyanogen mode,
so all problem from cyanogenmod 7 also carry on this ROM.
If you can live with:-
short battery life,
unstable 3G(lock & unlock phone can fix it),
difficult to download from android market and browser(seriously, i only can download something 2 times out of 10 trial, restart sometimes help),
no music & pic gallery( poweramp & quickpic can be alternative),
not all game work( most game i install will close by itself, only 4 out of 15 works),
accelerometer not work(it actually work at first but after you enter a game with accelerometer it will not work, restart fix it back),
cannot save the contact in the phone,
call will drop,
no fm radio,
no front facing camera,
camera lack of feature,
can't play avi, divx, mkv by default(moboplayer maybe can)
sometime can become sluggish, don't know why
all the benefit come from samsung will obviously gone,
(hardware accelerator for internet, slide to call/msg,music FLAC file, 5.1 surrounding sound, divx, bla2.., you get the idea)
that's all i ever encounter so far. I actually love this rom, it actually really fast, maybe
after they sort all the problems, i will dump the samsung rom. The feel of use this ROM
totally different from original android, it introduce a lot of feature inside the ROM
If you don't know basic about flash using odin( i know almost of you use clockworkmod recovery),
don't try it or you will in the big trouble if you want to recover back your original rom( especially
without the 3 button recovery/download should avoid do this). For some reason, my phone cannot
start when want to downgrade back to froyo, keep vibrating, end up to semi brick my phone. I need
to start all back from stock 2.1 to 2.2.1, really a long day to get my phone functioning back.
Actually this ROM quite stable for the beta, hope codeworkx and the team can eliminate all the bugs
inside the cyanogenmod 7. This is far the best ROM(without all the bugs mention before) i have tried