Lamborghini Reventon Roadster news - Frankfurt show: Lambo Reventon Roadster - 2009

There have been many extreme cars in Lamborghini's history. But this, say Lambo bosses, is the most mental of the bunch. This is the Reventon Roadster.

The drop-top version of the jet fighter-inspired hypercar has just been unveiled on Lamborghini's show stand, and it looks, in a word, awesome.

It'll be limited to just 20 units - of which Lamborghini says a dozen or so have already been sold - at a cost of £970,000 each.

That's a lot of cash, but you do get a lot of power: like the hard-top, the Roadster is powered by Lambo's 6.5-litre V12, putting out 661bhp and catapulting the Reventon to 62mph in 3.4 seconds. Top speed? A terrifying 205mph. With the roof down.

The Roadster weighs in just 25kg heavier than the coupe, and features a pair of hidden pop-up rollbars, which will deploy if you're daft enough to test the Reventon's aerial capabilities.

If you're in the market for a million-odd-quid convertible - and we know that many of you are - what's it going to be? This... or the Veyron Grandsport?