That's amazing there is not an alternative Angus artwork on acdc, it is so ugly.
So i can make a first analysis:
X-Men: worth. All the more as the $ gap seems to be the weakest compared to other games. Playfield and software are différents
Acdc: not really worth. All the more as the mini playfield is quite useless. Drop target bank versus stand up target bank can't justify the price gap. Better light show as for all premium machines
Tron: not worth. The biggest price gap as there is no premium pin. The eli ramp mod can tied LE machine. Drop target bank, recognizer moving.
Metallica: not worth. Just hammer toy added.
Star trek: not worth. Amazing light show However on premium/LE
Walking dead: worth. Light show, lifting ramp, crossbow
Kiss: not worth
Avengers:hawkeye ramp, minor price gap with pro.
LOTR: not worth
What about transformers, mustang, Avatar, rolling stones, wrestlemania?