Beware of the "Rocky" version of Pandora's box 3. Get one that clearly shows the words "Pandora's Box" on the angled case, not just the sticker. Those are the ones MOST people are happy with, but I haven't played the good one myself. From what I can see, they are not available in the $45 range, but more like $70 or so. Many of the vendors with the "Rocky" version are trying to hide it. When they don't show the writing on the case or if they don't show the board at all, then move on. As a general comment on multiboards, I suggest you assume that you are getting a fraction of the listed games. If 520 actually translated into 75 great running games, it would be totally worth it. Even if you only got 1 game that you really want, it would probably still be cheaper than the real board. Also, you will need to alter your jamma harness a bit or get the adapter. The adapter eats into the savings and if you alter your harness, you need to be sure to put things back before you swap out for a real board.
I'm not suggestion anyone avoid the whole thing since it's a cheap gamble if you want to take it, but having realistic expectations and a complete picture is your best chance at being happy with the purchase.