The Idro Matic is an option on the Spirit also. It does seem like more of an improved Spirit then a new Mirage outside of the new lever.
The PPIC does run from 0-3 bar but the Idro Matic only adds another 3-3.5 bar range. You can set it to engage at different points. Personally I prefer to run the I-M with the PPIC blocked off as I don't want a 12 second ramp to full pressure everytime I pull a shot. With the I-M alone you get an 8 second ramp.