Edit: I dont own one, but I have talked to an acquaintance about theirs before. The major downfall seems to be the maintenance costs. Other than that, they said the cruise took a bit to get used to, but they dont want another car w/o it and it is one of the most comfortable cars they have owned.
I had a CPO Mercedes on the list, but then I saw those maintenance costs that you mentioned and that has dulled my enthusiasm for them some. Might still try one on for size at some point. Not sure if i'm all that "fancy" yet. heh.
Test drove a Caddy ATS 3.6L today, it was nice, but nothing spectacular.