If there's one thing you can normally count on when it comes to selling cars, it's that no single product gets an unchallenged run at a market sector. As soon as a new type of car seems as if it's enjoying some success, a whole slow of second generation rivals will wade in. Being first is rarely the profitable position. The Toyota Picnic got to the medium MPV market early, but the subsequent Renault Scenic made the big bucks. Likewise, few remember the Renault 5 Gordini but everyone will know about the Volkswagen Golf GTI's success in the hot hatch market. Smart seemed to be largely unopposed with its city coupe/fortwo when it came to premium micro city cars but one look at the company's balance sheets explained why. Nevertheless, Toyota recognised when economic conditions had swung in Smart's favour and in 2009 launched the iQ, a small car to keep them honest. Here's how to track down a good used example.