Sorry if this has been covered before, but what is the difference between the Metallica versions? Are the premiums the same except for artwork? For example, amazon has a Stern Pinball Metallica Premium Monster Arcade Pinball Machine for $7063.55 with shipping for prime members. They also have a Stern Pinball Metallica Premium Road Case Arcade Pinball Machine for $7495.00. Just curious to the differences. Thanks.