Back in 1996, the first SLKs attracted attention - largely due to the car's Vario-roof, which transformed the open roadster into a hardtop coupé at the push of a button.The second generation introduced the AIRSCARF neck-level heating system, which makes driving with the top down pleasurable even at cooler temperatures. Now Mercedes has brought out a third generation SLK, which continues to set trends. It consumes up to 25 percent less fuel than its predecessor, and comes with the option of a Magic Sky Control Roof, to keep heat out on balmy summer days.