My boyfriend has an '04 350Z, the Enthusiast model. He is completely in love with his car, and has had a great experience dealing with Nissan when he was getting it. He hasn't had any problems, but has chosen to do a lot of upgrades/modifications, and has really liked the people he dealt with both at the Nissan dealership and car shop.
And its really fun to borrow, cuz heads are always turning to see who's driving the car, lol...very fun to drive.