I have been tuning a vipec for a few weeks now, and with the new software it is awesome. The help section in the software is great to have if you are like me tuning your own car.
It took me no time at all to get a solid idle, and the car to cruise decent from a base map. I have only ever had experience on AEM, PFC and hondata briefly.
Here are some screenshots of the new software:
But the best part is the new mixture map shown below. You datalog a pull, pull the log up and the cells you passed through show up on this table. You set a desired AFR, and it displays the actual. After the log, you double click the cell and it tunes the fuel map itself. Doing this twice is supposed to be withing 1% accuracy.
A plug and play RB26 ecu is available, with an onboard 1.5bar map sensor, boost control, etcetcetc.
God help me if I ever use an AEM on an RB again. The CAS issue it had drove me up the wall. I spent hours trying to figure it out, the vipec took me all of 5 minutes to set timing on ECU. Set base timing on ecu in degrees, check with timing light and adjust cas to match ecu. Done.
However, if I was on a tighter budget I really believe nistune is big bang for the buck. PFC is proven as well. The PFC would be a choice I'd consider if it was for the right price as well.