I like the new design of the interior, much more modern feeling, the cup holders are in a much better spot, no longer hit your arm when shifting, as far as performance it seems a little sluggish compared to my S197, that being said the transmission is much smoother and shifts much easier which was a big thing I didn't enjoy about my s197, but my S197 had some money put into horsepower so it's hard to judge stock s197 to stock s550, all in all I love the new S550, it rides great, seems almost luxurious on the inside and is beautiful exterior wise, I just can't wait to start modding, couldn't help myself and order an MBRP cat back already