You are lucky indeed! A Cliff Hanger, Tempest, and two cocktail tables! What are the two cocktails? As for multiple players on one unit, I'd like to see how well Bubble Bobble accomplishes that. It's simple compared to SFII; less demanding of space but I wonder if two players can comfortably use the same unit at once. I managed to play two player on the Coleco tabletop version of Pac-Man just fine, and that's about half the size of this unit. Of course, I was much younger and smaller then, as were the people I played with.
The 1/4 scale is the perfect size, at least it has been for the single player and alternate 2 player games(It can be used without major compromises needing to be made). I never really had any plans to use these for 2 players co-op, as it never seemed feasible, and my main draws to these is the games being authentic for display purposes. It's just icing on the cake when SF was actually very playable, just not ideal, but cool to have the option to play it as is.
Those Coleco games were the best(not really, but for the time, amazing), and one of the few toys from my childhood, that I never received as a gift. I bought a whole set as an adult, but sold them off years ago when making room and paying down some debts. I recently found the Game & Watch emulator, which actually emulates some of those old Coleco games, great memories. Every time I buy one of these newer units, I think of those old Coleco offerings, and thinking how I wished those would have been this good back then.
My two cocktails are Donkey Kong and a DK Jr., both in rather good condition, especially considering there both original. Neither seem to have seen much use, or appear to have been used in any real bar settings(Thank God). LOL