Some observations from factory wipe and install.
Very smooth, very fast. Visually great.
Search and gmail immediately force close. A simple clearing of data through apps section helped correct this issue.
Gps was not working, no satellites. Flashed Experia GPS files found here
and was able to get a lock. Have not tried after Deep Sleep
S-Voice is buggy. Force closes frequently and talk button doesn't work many times.
That's all I have for now. I haven't tried the newest subzero because of wifi calling (is there a wifi calling zip for this?)
Overall it is tremendously great work.
Assault: T.959 Vibrant