I was using Interim_Ivy_Bridge_Lion_AppleHDA_v1 in ML and it worked very well. Ever since 10.8.5 and the need for me to change npci=0x3000 to 2000, I've been able to use the MBeast kext with the DSDT edit.
I noticed, however, that the audio is louder with the MB kext and it lacks in dynamics...