I was looking for a thread I remember from a Slotland employee claiming that SpaceJack was fair (apart from the shared jackpot). I can't find it now though but I found a couple of other related threads. If you play SpaceJack without going for the jackpot, it obviously can't be randomly dealt because the payout would be over 100% for optimum play.
http://www.casinomeister.com/forums/...ead.php?t=1029
http://www.casinomeister.com/forums/...ead.php?t=1821