Metallica would go great next to both AC/DC and Guns n Roses in my collection.....but, too soon for another music pinball machine I reckon. I just finished playing a great game of AC/DC and thought how great KISS or Metallica would be as a pinball machine, but my bank account is saying no right now. I think Stern are onto a winner, so they'll keep milking their cash cow with full song tracks.