All features of MIUI are working fine.

There may be other bugs present. If any found please report to miui port team.

 

Note: I am not responsible for any harm caused to your device. So flash at your own risk.

Flashing Instructions: 
Backup your current ROM using cwm and MTK droid tools before making any changes to your mobile.  (Important)
This step is very very important otherwise the miui rom will not work and will give you cwm error while flashing updates every week. Go to the download section and download your device respective boot and cwm recovery zip file.
Extract the zip file and rename the recovery image file to recovery.img and then flash the cwm recovery using mobile uncle tool.
Download the ROM zip file from below link.
Put the zip file in the sdcard.
In CWM Recovery:
wipe cache, data, dalvik cache, system
Select Install Zip From SDCard.
then Disable Toggle Signature Verification and Toggle Script Asserts
then Reboot Recovery/system.
then go to recovery again and Flash MIUI Zip File
Reboot. Njoy !!! 
If you have any doubt in flashing then please ask before flashing.