Adding to the OP's question, what about the PCV vs the PCIII vs the PV? Is the PCV a decent compromise to the PV? Is the PCV a worthwhile upgrade to the PCIII?

 

I have the PCV, I don't think it's worth upgrading to it from a PCIII, if I remember correctly the main feature of the PCV over the PCIII at the time was it's smaller size.
From what I have seen on the forum the PV is a whole different animal and seems like it might be worth the upgrade from the PCIII or PCV.
Personally my bike runs great with the PCV & map that Fuelmoto supplied so I have no reason to change.