The SL55 puts track performance and handing capabilities into a comfortable street legal vehicle. That would be difficult to improve upon. I have owned other more exotic sports cars, some at twice the price, and the SL55 is the best to date. Anyone considering the SL65 should go to the SL55 instead. The added 800 pounds up front in the SL65 has a huge negative impact on handing, which is why the SL55 consistently beats on US and European tracks.
Handling. Tight turns are a joy to take at high speed. It outperforms Ferrari and Porsche in the slalom.