I don't really know the ruleset on AC/DC, but I played it quite a bit last month. It might have pushed STTNG aside as my favorite pin. I had a blast playing it. I am going to buy a GnR first, since it seems harder to find, then AC/DC is a sure buy later this year. I played a couple games of Metallica, and didn't care much for it. I love the music, but the callouts were bad enough to keep me out of that part of the building at PAGG on the second and third day. I am going to try to play Metallica again on Friday when I am in California so I can get more of the feel for the gameplay.
I played AC/DC Pro (with great looking LEDs by the Nifty LED counter), Premium, and BIB. All 3 were more fun to me than any of the other pins there. I think the premium is worth the extra cost over the pro, but the pro is a lot of fun on its own. The BIB is incredible. Not $4000 over the premium incredible, but I am definitely glad I got a chance to play it. I hope Metallica improves the callouts. I like every track on that pin, and I really hope I end up liking the pin enough to buy one.
I also didn't notice more drains than I would expect on AC/DC...on any of the versions. Maybe I am just not a good enough player to make the dangerous shots. I don't think there is a more satisfying shot in pinball than hitting that bell for the first time.