Good question

Several of the 70 are Joust/Robotrons
With a couple of Williams Multi
We are now into the occasional new listing so ...If I'm close I will play it.
From a play standpoint they are the toughest. The Multi-direction stick and the digital flap button don't respond. Game play to 10million can be 5.5 to 6 hours.
You have to adjust a lot: example the flap button doesn't allow you to float- if you are hitting it you drop like a rock!

But that's what makes it interesting right,
The fight; all these machines have their own personality. They are 30 years old and many have replacement parts. So each one takes a bit of adjustment

The one at Bene was originally a Joust and had been converted.