I just did a clean install of the newest build (including flinny's mic fix and pa-gapps-nano) and I must say that I am really impressed.
I did not expect my old phone to be that smooth and responsive. Indeed, it seems to be comparable to the LG Optimus 4X HD (my current device) running CM11 as well.
I must say that I did not test everything. With the last build I had an issue with the microphone (in some babyphone apps there was simply no audio being transmitted) although it worked in call and for other apps like sound recorder and google voice search. This problem seems to be gone now! Wifi works as well, more I cannot say for now.
Many thanks for making this device useful again in such a beautiful (smooth) way!!!
PS: after a reboot it is still working like a charm