There is one of those in Las Vegas at the Pinball Hall of Fame, so I got to play it last year. It's a fun curiosity and seems someone was giving it a go about half of the day. I played a total of four or five games on it and it was kind of fun.
It's not a game that has any staying power in terms of interest. If you had a dozen pins or so it would be worth having in your lineup for the oddity and change of pace factor. I'd certainly say it's funner for others than for yourself. Certainly worth the AUS $300 it s up to so far, but even considering its rarity I don't think they're worth much more IMO.