Bought one used after deciding I needed a new car. Went with the 350Z rather than a WRX or S2000 simply because its sexier than the Subaru and more muscular that the S2000. Been extremely satisfied so far. Drives like a dream, hugs through corners without a complaint, tranny is relatively solid though clunky, and even gets decent MPG for a sports car. Definitely turns heads, especially with the Solar Orange paint, as its more rare to see than the likes of Mustangs and Camaros. My only serious complaint so far is the interior quality -- the black paint- like surfaces are easily scratched up. The interior more or less looks like a cheaply constructed cockpit.
The 6-speed, the "HEY LOOK AT ME" styling, and tight steering.
Better road-noise dampening, stereo upgrade, and improved interior quality.