This might be a bit late to help, but I just purchased my NP300 which had iDrive installed and it makes a HUGE difference to performance. I run the unit in 'stock' mode most of the time as i use my Nav for commuting, but out on the trail when I switch to 'ultra' mode the throttle becomes very responsive and it's real easy to get power to the wheels without pushing hard on the pedal. It's also great when in traffic and you need to enter the flow of traffic quickly, just flick it to 'ultra' or "AC" (auto) mode and you can easily accelerate and zip around. Haven had one would I get one again? DEFINITELY!