I had a 350Z for two years, sold it this March.
Basically a good car, handles excellent, decent seats/driving position and equipment, reliable.
Phase one, two and three, ignore phase one, phase 3 is noticably better in many ways.
Identifiable by the bulge on the bonnet and LED rear lights. 313BHP
Weak points
Crappy squealing brembo discs, bin them and fit something like DBA grooved but not drilled with a good pad and it will track day all day with regular fluid changes.
Tyre noise, nice thick acoustic foam applied to the bottom of the boot carpet helps here so does the luggage compartment cover. Use noisey tyres and you'll be sorry as the bluetooth is drowned out.
Other than that, great car, phase 3GT is best buy.