Like spring flowers, more and more new convertibles are opening up to the sun. Opel's new four-seater soft-top Cascada convertible is making a bid to enter the premium class. At 4.7 meters long, Opel is targeting the premium category, including the BMW 3 series and the Audi A5. Even with plenty of options, however, the Cascada is available for just under 26,000 euros.