I have both machines, and it is hard to split them sometimes. VERY hard to find either title, and even harder to find a machine in great condition. Here's a rundown;

Fathom - I had to import mine, and I paid a fair bit for it, even though it was a project. I now have THREE Fathoms! I have a repro playfield and two plastics sets. It will be a full restoration. Chances of finding one is very slim, and dealers that would have them would be asking around the $4200 - $4800 mark for a GOOD ONE. In terms of playability - This is an awesome machine. It is the complete package as the game looks great, plays great and will keep its value well after other machines have been moved on. The ultimate Bally


Medusa - Again - I had to import mine (through MarkC). There will be a repro playfield, and I already have the plastics set. This machine was REALLY nice when I got it and I have not seen one better. Bit cheaper than a Fathom, expect to pay around $2200 - $2800. I've seen them sold for $3500. This is a more challenging game than Fathom - a lot harder and faster. No multiball. Like fathom - Several targets and the display in the center of the playfield it a timer for "extended time" and "bonus matching" - hard to explain, but the game sets a "goal" for you via the display and you need to hit the corresponding targets. Very unforgiving machine. Some would say it is the hardest of all Bally SS.

If "money is no object" - Fathom. Medusa will be very hard to track down. Fathom is the better machine - but only just !