ok, somebody brought TZ into this so I have to comment.  

After a month without playing my TZ (since the purchase of the STTNG and SS) I finally decided to play it a little last night. WOW, it blew me away again. It really does strike the right balance! The ball sometimes floats slowly across the playfield and the next it is lightning speed (don't blink).

I honestly think the only complaint anyone could have with TZ is if you were the type that likes COMPLETE non-stop action (no sink-holes - just raw speed!)

As for IJ4 vs MB. While I have not played IJ4, based upon the videos and my playing on MB, I think it would be MB hands down as well. Of course you never can tell for sure until you have played it. Look what happened when Jim let me play his SS - I just fell in love with the game.