All 3 really different instruments for different purposes. For example if you use the modulation capabilities of the P12...a P6 may seem quite limiting. And a P2 is mono with a nice sequencer and different filters...etc... I don't think one really replaces the other. I would like a P6 NEXT TO my P2, but certainly not instead of. My 2 cents. All depends on what you want/need to get where you want to go.