In this country at least, folding hard top roofs are a winning strategy. It's been well publicised that despite racking up a fairly hefty number of rainy days per year, we take to convertible cars in an apparently inordinate way. The folding hard top offers a rigid metal shield for the elements to thwart themselves against and when your car is parked up overnight, there's reassuringly robust protection against Stanley knife-wielding hoodies. On those fleeting occasions that the sun makes an appearance, a single press of a button and the roof disappears into the boot and all the inherent compromises that come with the purchase of a convertible car are forgotten. Lexus has done as much as any to try to smooth those compromises away and in the sleek shape of its IS 250C, it has a car that builds on the already great reliability record of the IS range. Here's what to look out for when you're shopping for a used example.