A friend of mine and I played the Silverball Mania iA LOT n a bar in Jax WAAAAAY back in the 80s. It was just too darn easy to play and beat to be one to buy or to be a keeper - just IMO. In fact, in the early 90s I bought one from an operator that was in OK shape but not working and I framed the back glass and hung the PF on the wall and scrapped the rest of it. In hindsight I could have kept it intact cause the pin "eye candy" value was good but as a player's game it wouldn't justify the space that a better game could fill.
I may have a complete set of plastics if anyone wants it but I'll have to dig through my pin "grave yard" boxes of stuff to see if I can find it.