I bought the Benz a couple of weeks ago and love it. I have been a loyal BMW fan for the last 10 years, but wanted a change. The E550 is the perfect car. Full of power, and leaps ahead at the slightest press on the accelerator. Nice tight German car steering. The car is quiet and purrs along with a very smooth ride, which is quite different then the bone rattling ride that I had with my BMW 530 with run flat tires. The car itself is gorgeous with clean, classic lines, and a beautiful interior. As expected the gas mileage is not great, but you don't buy a V-8 engine expecting to get excellent mileage. Love the car so much that it is a disappointment to get to work in the morning.
I love the Ipod integration kit--it works seamlessly with the car. The automatic trunk closer is terrific, and the phone and navigation systems work extremely well together. Also like the parktronic feature. Four zone temperature control and heated and ventilated front seats are great too.