I had a Hyperball a few years back.  That and a Rapid Fire.  The Rapid Fire was such a bad seller for Bally they ended up turning the remainder cabinets into Centaurs and EBD Deluxes. 

They're fun to play for a short time but you get tired of them very quick.  If you have people over to play they'll get played as they do have a novelty attraction but if you're wanting one for strictly your own playing I woudn't recommend it.

I played one when I was a young chap and was set on getting one recently.  I agree with James that I think it would get a little boring over time and especially in a small collection.

But I think if you had a good size collection and space wasn't an issue it would be a good filler.

Shame they don't come up often locally and when they do its around the $1500+.

In the States they seem to go for around $500.00 to $700.00 which is about the right sort of money IMO.