I have a new and older design LBK now and I have to say I appreciate the refinements in the new LBK.
My first kit was a gift and came with the classic light extract and an "old" LBK.
When I say "old", I mean the one that comes with a white lid and white spout, and by "new" I mean the one with black lid and black spout. (I guess there is even a newer spout now!)'
The biggest benefit I see is that the brown plastic that makes up the new LBK is more transparent than the old one so it is easier to tell what is going on with the beer in the keg. Even without a flashlight, I can see what is going on. I assume the brown color of the plastic does enough to keep the light out.
Thanks to whoever designed the improvement to the LBK!