For The Z4 looks amazing, and the cabin oozes class. It’s great to drive, with strong engines, thrill-a-minute handling and a supple ride.
Against The absence of four-cylinder engines makes it quite expensive to run and there isn’t much space in the boot when you’ve got the roof down.
The Z4 is the real deal: it looks and drives like a proper sports car, and it makes you feel special every time you get in. Little wonder it's our 2010 Open-top Car of the Year.
Gone are the days when you had to choose between roadster and coupe Z4s – there's now a single version that serves as both thanks to a folding metal roof that disappears into the boot in around 20 seconds.
Buyers can concentrate on which of the six-cylinder petrol engines they want, then. There's a 255bhp 3.0-litre and a twin turbo 3.0-litre that churns out a whopping 302bhp, but even the entry-level 201bhp 2.5 will be fast enough for most people.
At the moment, BMW says it has no plans to introduce a high-performance M model or any cheaper, four-cylinder engines, but we'd be very surprised if these didn't follow in time.
Reliability shouldn't be a problem, because BMW has a good record in our surveys. The one unknown is the folding metal roof but, like the rest of the mechanicals, it's covered by a three-year unlimited mileage warranty
The twin-turbocharged BMW 3 litre is one of the…