I tried TWINE for EX.

Let’s just say I quickly realized that the sound design simply is not as good or involving as GE or TND.

The audio does indeed come out the rear but in fits and spurts. I tried both EX and PLIIx which the latter is technically superior. No copy is flagged for EX, and the track seemed the same on SE, UE and BD. Finally I watched the whole BD and toggled between straight 5.1, EX and PLIIx.

What I found is that the decoded track seemed to pull too much into the rears and not be very detailed. The weird thing was the best sound came from straight 5.1 and then there were (few) distinct rear center effects! These came out of nowhere, and were perfectly centered in the rear despite not having any rear decoding on!

So what I gather is, judging from the interview with the mixer who gushed about EX saying: "I just left it on while working, it’s great."
They simply put some noises in the rear by mixing them between the two rear surrounds.
Admittedly I’m not too experienced with this in my setup yet, but I did run tests with AOTC in EX-finding that it does help effects, pans and whatever was already there-also that PLIIx is better than EX and works with anything.

Unless that rare Japanese LD really does have an aggressive EX track, then this is as good as it gets.