Well I do, but its only 500W. RMS
I do, however, keep it tuned down, and use it just to hear the bass line I've been missing from my cd's (Bloodhound Gang, Evanessence, Frank Zappa's "Joe's Garage", etc). I only have it because its free (ok... and because I like loudn music).
However, I definitely like the install, very clean, and doesn't block access to the spare. Something I'll keep in mind for my parent's anniversary this summer, since my mom and dad share the '87 300SDL when not driving their respective Dodge products (which turns out to be quite often... I may end up having to find an MB just for one of them).