Tesla Motors isn’t your normal car company. And the Tesla Model S isn’t your normal executive saloon.

This is a car that can seat seven and, in its most powerful guise, can match a Porsche 911 Carrera from 0-60mph. It is also, of course, electric, albeit an electric car that can travel up to 320 miles on a single charge and then takes only an hour to be fully recharged, figures no other electric car has even come close to matching yet.

Tesla has just invited the Model S’s 6000 worldwide reservation holders a brief test ride in the car at the firm’s Fremont factory in California, ahead of the first deliveries to customers in mid 2012.

It was a significant and brave invitation, given the car is only 90 per cent finished. Most of Tesla’s wealthy customers would not have experience of seeing development cars, which invariably feature panel gaps or a ‘rough around the edges’ interior.

Before my trip in the passenger seat, Tesla’s charismatic owner and CEO Elon Musk gave a presentation on the Model S that outlined it as perhaps the greatest car the world has ever seen.