My uncle left one in my care a couple years ago, with the request that I "fix" it. Because I have pinball machines, therefore I must be able to, and want to, fix an old "pinball" like that.
I quickly figured out it what it was (hadn't heard of pachinko before), and that it actually worked fine - it was a 70's nishjin one, it only needed power for a couple lights. Although he kept all the balls so I couldn't do much in the line of testing or playing with it.
I've seen a modern one that I would love, a Macross Robotech one. It has a joystick and some sort of built in video game. Not much exists online for gameplay videos or instructions. This one must be in high demand, because there is a broken one on epay right now for $1200 US plus shipping.
Been thinking of getting a less expensive modern one to tinker with.