Ive been playing with it for a few hours.

the biggest bonus is that it "automatically" converts all the existing surfaces... but as far as ive been able to figure out, its not as complete a transfer as you might hope.

I still had to go in and tweak the surface settings to get anything close to what I wanted.

the biggest thing missing is the ability to change renderand light settings on the fly and get instant feedback in LUX

another thing missing is stop and start rendering.

Its got a long way to go.