I have loved my S55 for 5 years! Perfect combo of ultra-luxury and high-end performance. I was lucky to get the car with a Starmark warranty, which covers the car for 7 yrs/100K miles - The car has had close to $10K in warranty work since the standard warranty expired. This is a VERY expensive car to maintain - the AMG parts are much more expensive than the S500 parts and many dealership service departments don't have the know-how to fix these cars properly. I found a dealership that kept mine running quite well. I will probably sell mine before the warranty expires to avoid the high cost of maintenance. It will be a sad day when I hand off the keys. It's been a GREAT car!
Luxurious interior, Best seats ever, Acceleration, Handling - It's all good!
More advanced technology would have been nice - the limited phone compatibility was disappointing - Nav CD utilized the only in-dash slot on the stereo - should have put that in the trunk...