Quoted from mbeardsley:This has been discussed ad-nauseum here.
All that does is save you the cost of the cabinet (which is a minor part of the cost to develop/design/build a machine). And drives up the cost of everything else in the machine. And puts a bunch of extra limitations on what you can do and still be "compatible" with previous machines.
And then, you've bought 1 "full" machine, and a couple of more "half" machines to interchange with them. But you've only got one machine at a time that can be earning (or played) - while you've got to maintain storage for the parts that are not currently installed.
Seems like a lose-lose situation to me. The P3 system has not exactly set the world on fire. And Williams tried it with Pin2000 and it failed miserably.
Actually p2k was a huge success. B/w sold more units than they have in years. They already wanted to close the doors on pinball because they can can charge the same for a slot machine with a fraction of the cost. They thought they gave pinball team an impossible objective. And they surprised them with something revolutionary. The head people already had their eyes set to close the doors regardless in how successful it was.