I haven't figured out the various combinations of multicarts and boards yet. And then you have the PITA marquee lighting for the big red 4's.
FWIW, I have a 2-slot that sees more play (even without a multicart) than any other cabinet in the house. Most of the games are just fun and people like them. If you don't mind bootleg carts, the prices for new games aren't insane.
Other than my grails (Multi440Exidy, MultiWilliams, Galaga, Joust Cocktail), it would be the last cab that I would let go of ... and I paid $325 for it.