BMW knows a thing or two about roadsters and this improved second generation Z4 proved to be one of its best. It may not be the sharpest car in its class from this era to drive, but on the right day, in the right mood on the right road, you may not care, providing you're a fan of metal-folding roofs. The engines are efficient and willing, the looks are still stunning and the feeling you get behind the wheel still makes you feel twenty years younger.