I have a 1972 William's Swinger, I traded an old laptop for it sight unseen and it's still sitting in my garage on the hand truck. I went to PAPA 17 and they had one there, I think I played it about 40 times over the course of the event. The last day it was out of order, so I think I broke it.
I was suprised to learn that it had kickback and a shooter return gate, It's a really fun game! There is a 2 player version also, but I can't recall it's name at the moment.
Anyway, Swinger seems like a great game, it was also the first EM with DC flippers. I'm already making room in the workshop so I can get it up and playing.