There's not only one port, but already two full-ROM ports from different developers: Cloudyfa and OptimusRs. Both of the ROMs should be stable and contain all G3's features.
As mentioned, there are two builds:
Both of them should be stable enough, though you should definitely make a backup. Installation is basically the same, flash via recovery. You need to flash the KitKat Baseband on OptimusG3 ROM.
Both of the ROMs are coming with Aroma installer.