Baby coupé-cabriolets often end up as something of a joke - you've only got to look at the Mitsubishi Colt CZC and Nissan Micra CC for the proof. Some work better than others though, like Vauxhall's Tigra for example. Quick enough, reasonably well packaged and decent to drive with the roof up, things only go awry dynamically when the roof is dropped - which kind of defeats the object really.