What are the pros/cons of e55/63 amgs?

I've been looking at e60 m5s, e63 m6s and w211 e55 amgs. I know a whole lot when it comes to the m5/6s but nothing when it comes to the e55/63s.
In the m5 universe there are a couple of years you want to avoid because of various issues. I was wondering if the same applies to the e55/63s.
What are the pros and cons of certain years for the w211 amgs? Common problems to look for? I appreciate any input and thank you in advance!


