I have owned this car for 2 years now.
Bought it used with 127,000 kms. and have had nothing but a great experience with it.
Excellent build quality and a lot of information on forums and the like to troubleshoot any concerns that have arisen.
All in all I have to give Infiniti/Nissan a full two thumbs up on this car. All subsequent years of the production of this car seem to get better and better. I have test driven everything from a 2005 G35 to a 2013 G37S and can't say one negative thing about it.