The one issue—serious to some—with the G37 Convertible is that it's heavy—about 450 pounds heavier than the Coupe. And it's a weight difference that you really feel when you drive the Convertible hard. There's a fair amount of body flex in the G Convertible, but otherwise it's very well designed, with its top that can open or close in about 30 seconds.
If you don't plan track time, and won't fret that the G Convertible just isn't as perfectly balanced in hot laps, you'll find find it quite delightful in most other respects, with nice steering and an eager, strong powertrain with a 325-horsepower, 3.7-liter V-6 combined with either a six-speed manual gearbox or seven-speed automatic—with the automatic including steering-wheel paddle-shifters and satisfying throttle blips for seamless downshifts. You'll find the G37 accelerates nearly as quickly as the Coupe, with zero to 60 in about six seconds.
Inside, the Convertible presents with virtually the same interior as the G37 Coupe (and the sedan, for that matter). Snug sport seats provide decent side support (though they're a little narrow for some) in front, but especially in the drop-top the back seats are nearly useless with the top down and completely useless (for all but the smallest kids) with it up.
The Convertible's features and options closely parallel those offered in the Coupe. For more information, see our full review of the 2011 Infiniti G37 Coupe.