I guess if you read this post....then yes....
http://www.350z-uk.com/forum/viewtopic.php?f=61&t=40232&hilit=+bigbramble
I think it all depends on your driving style, if you drive ever where with your ass on fire and use your car on track then you would probably notice the difference. Don't get me wrong I don't drive at 3mph, the feel of the car is a little different in cornering but to me its not that much. Maybe I an not as tuned in to that stuff as others are. For normal and spirited driving which is just about all you can do on our roads I think its fine.
I like the look of the spacers and am happy with the way it and I drive. JMO