[Galaxy S III I9305 (4G LTE + 2GB RAM) Android Deve] Glenn2:
I use this ROM and it is by far the best ROM I've tried, provided you use AGNi kernel. You must use the SMDK versions (as there are two types) and the best one I've found is version 4.4.4. (I know this sounds like KK but the number is just a coincidence, it's on 4.4.8 now but I think 4.4.4 is smoother somehow.) AGNI escapes a lot of problems because SELinux policy is 'permissive'. CM kernel is 'enforcing' which doesn't play nicely with some apps, although I'm sure it can be hacked.

I won't comment about bluetooth as I never use it.

Screen colours: 2 ways to adjust:

1) AGNi has something called MDNIE hijack which is 2 replacement colour profiles. If the colours are still too strong you can modify them further by changing some other parameters with an init.d script. With scripts you can have full control over colour saturation and colour balance. I removed a green tint from mine by doing this. I can explain later if you need any of that.

2) There is also an APK in CM12.1 called Advanced Display, but no way to launch it in the settings since CM11 ! You can use Nova Launcher and add an 'activities shortcut' widget to launch it (very easy). Then you can set MDNIE mode and scenario to taste. (This is with MDNIE hijack off). It works fine with AGNi but not with the CM kernel (probably SELinux related). One you have it set how you like you don't need to use Nova Launcher anymore if you don't want to, but I still do as I find it superb.

EQ:

1) AGNi has the Boeffla Sound module included which gives full control over the Wolfson codec. However the AGNi control app has limited controls for it and has some wacky defaults such as stereo expansion turned on (yuk). At the bottom there is a setting that says "App: Reset Sound settings" which removes all installed default scripts relating to sound. Do that, reboot, then install 'Boeffla Sound' from Play Store, which is by the author of the module. This gives you access to a 5-band hardware equaliser. The EQ is then done in the Wolfson chip itself not the ROM or kernel. Note that it is important to select "Over-Saturation Suppress' or you will get compression at high volume. Also set DAC Direct and DAC Oversampling. You can raise the volume of the analogue headphone amp too.

2) If the 5-band EQ is not enough and you want some super bass boost or some other effects, I recommend installing Viper4Android. This is an alternative software EQ but much more configurable. If you use this, turn off the hardware EQ in Boeffla but leave the other settings on, they are still beneficial (you are only replacing the EQ). Note that again Viper4Android doesn't work with the CM kernel (SELinux issues) but works perfectly with AGNi kernel. Whether you use the Boeffla hardware EQ or the Viper4Android software EQ, you will get the benefit in ALL applications.

I am extremely fussy when it comes to screen and especially sound, and with all this done my S3 has gone from bad to excellent on both counts.

The ROM is also extremely smooth. A few have commented on random reboots but I've been using this ROM for many months (always with AGNi) and it's never happened even once to me. Only had any problems with CM kernel.

Happy hacking!

Glenn