Ok, I have finally downloaded and flashed it using mobile odin. It is extremely smooth! Certainly smoother and faster than LSC. As for features: Multi window works, spen works, air view doesn't
work. It is slightly faster at launching some apps but still not as fast as ICS. Haven't yet realised any major bugs, but I haven't tried everything in it. For those of you who are interested in the black clipping - it is still here, as strong as ever.
If anyone else has some questions that a user can answer then don't hesitate to ask