I owned a 2007 CLS63 AMG once.
Two things I take from the ownership other than the car was a blast to drive.
1- the AMGs tank in price very fast. Mine almost depreciated $10k in one year.
2- If you have no extended warranty, be prepared to fork out some bucks on the stupidest stuff. A weld point came loose in my oil pan. Mercedes refused to cover it. $ 400 for an oil pan.