Personally I keep vdc on most of time but when I know of situations where I'm gonna be flogging but paying attention, I'll turn it off, especially to keep power from cutting.
I found an article on Nismo but the writer warns about vdc off but also sums up Z in the first sentence for me.
"
The Nismo 370Z is a throwback to a time when you had to really know how to drive a car to get the most out of it. There are only 100.4 in. between the front and rear tires, 4 fewer shorter than the old 350Z's from 2003 to 2008. That shortness causes the 370Z to be a bit twitchy and tail-happy, like a Subaru BRZ, but with higher limits. The Nismo 370Z doesn't have a multitude control modes like most newer sports cars that allow even inexperienced drivers to feel like racing rock stars.
It has two: Stability control on, and a mode that will read you your Last Rites if you run short of talent."
Read more:
2013 Nissan 370Z Nismo Road Test - Automotive.com