The SynchroRev manual transmission isn't bright-and-shiny new anymore, but it's no less gadget-cool for that fact; it's also a very successful, working system. Grabbing some of the best from the dual-clutch world while preserving the engagement and simplicity of the traditional manual transmission, it's the best of both worlds--and it can be deactivated if you like. The gearbox itself is a touch heavy and stiff for some tastes, but it delivers precise, predictable shifts. The automatic transmission, on the other hand, with its paddle shifters, does a passable job of emulating dual-clutch fun, but it doesn't rise to the occasion of a track-day or extended sport driving on the open road.
With a bit less wheelbase and weight than the 350Z that came before it, the 370Z feels, and ultimately is, a bit more nimble, too. The slightly dull steering, communicating little feedback to the driver, detracts from the feeling somewhat, but it's not enough to get in the way of enjoying the 370Z's stiff chassis or grippy road-holding ability.
The Roadster softens all of the 370Z Coupe's traits a touch, with a little less rigidity from the chassis, but the open-top factor may well outweigh the slight hit to performance if you're a fan of convertibles. The NISMO, on the other hand, heightens all of the 370Z's traits, from acceleration and handling to ride stiffness. Whether that's something you can live with on a daily basis is a matter to be determined on an extended test drive.